Open Access

An analysis of causal asyndetic constructions in United States history textbooks

Functional Linguistics20141:5

DOI: 10.1186/2196-419X-1-5

Received: 12 September 2013

Accepted: 8 November 2013

Published: 10 April 2014


Over the last three decades, an increased focus on engaging K-12 students in historical thinking has highlighted the importance of providing students with direct instruction regarding how causal relationships are formed in text. Many teachers provide this instruction by focusing on explicit causal structures, neglecting implicit forms of causation such as causal asyndetic constructions. Studies of United States history textbooks have found instances of causal asyndetic construction use, similar to the implicit constructions found in studies of spoken and written discourse. This study examines two questions: (1) Do causal asyndetic constructions occur in history textbooks with similar frequency to causal conjunctions and causal material processes? and (2) How is causal asyndetic cohesion signaled in history texts? A mixed methods analysis of two middle school and two high school textbooks demonstrates that causal asyndetic constructions are used as frequently, if not more frequently, than explicit means of expressing causation; they are signaled through authors’ uses of modals, mental processes, relational processes, and verbal processes. The use of mental processes to signal causal asyndetic constructions far outnumbered other implicit signals, accounting for 58% of the total. These findings suggest that teachers need to provide students with instruction about how to identify and make meaning of causal asyndetic constructions as well as causal conjunctions and explicit processes.


Causal asyndetic constructions Causation History Textbooks


Causal connections are semantically important for constructing and comprehending history (Achugar and Schleppegrell2005; Carr1961; Coffin2004,2006; Moss2005); they explain why events occurred. Without causal connections, it would be difficult to discuss important abstract concepts such as power, privilege, agency, and authority because causal connections provide “an important ordering principle of human perception and human experience” (Noordman and de Blijzer2000, p. 35) and especially for explaining the relationships between historical events (Novick1988). Unfortunately, youth are usually taught history via textbooks (Nokes2010), which often neglect making causal connections between historical events, favoring a chronological narrative (FitzGerald1979).

When history teachers provide instruction about how to identify and construct causation in text, they often focus on using causal conjunctions between clauses such as because or so (Noordman and de Blijzer2000) and sometimes on causal processes, realized by verbs such as led to and forced within clauses (Achugar and Schleppegrell2005). These explicit causal signals are used to teach students about causation at all educational levels – in elementary (Williams et al.2007), secondary (Meyer et al.1980), and post-secondary (Meyer and Poon2001) schools. Implied causal constructions, such as causal asyndetic constructions (CACs), have not been given much attention in the literature. Found in verbal discourse (e.g., Gohl2000; Lyda2006) and written discourse (e.g., Blettner1983; Fitzgerald2011; Rosette2009), asyndetic constructions occur when coordination between two clauses is apparent but no overt coordinating conjunction is present (e.g., and, or, but, so, because) (Muller1991); asyndetic construction are not necessarily causal. Relevant to this study, however, CACs occur when two clauses lack explicit causal connectors between them. For example, instead of writing “Lee retreated because he thought he was outmanned”, an author using a CAC might write, “Lee thought he was outmanned. He retreated”. By eliminating the causal conjunction because, the author makes the causal connection between the two clauses less explicit, although that connection might still be surmised in context. This study explores the frequency of CAC use in United States history textbooks and the means by which they might be explained semantically, helping K-12 students to better recognize and comprehend texts that employ them.

Causation and history instruction

Amongst all of the historical writing genres, time and causation are two ordering principles that enable authors to make statements and arguments about the past (Coffin2006); indeed these two principles are intertwined in all historical works (Rogers2011). As authors’ historical arguments become more sophisticated, however, causation takes a more central role than chronology. By bringing together disparate historical evidence, chronological explanations are often unable to facilitate the arguments historians intend to demonstrate (Novick1988). Complex nominal groups, causal material processes (CMPs) realized through verbs such as forced, made, and caused, and cohesive structures are frequently used to make causal connections in support of a historical thesis (Coffin2004). Thus, while both time and causation are important for history students to learn, instruction in how to identify, comprehend, and create causal connections in text is important for developing students’ historical discourse skills.

Developing students’ historical discourse skills has become increasingly important with the increased instructional focus on historical thinking skills (e.g., VanSledright2002; Wineburg2001). To enable students to think historically, teachers provide students with multiple primary and secondary sources about a particular historical topic, asking them to (1) source, (2) closely read, (3) corroborate, and (4) contextualize the texts to produce their own historical interpretations (Fitzgerald2009). Although the historical interpretation might be presented through various historical genres (e.g., historical account, narrative, argument, etc.) (Coffin2006), the goal is to enable students to develop their historical analysis and writing skills to a level where they can create sophisticated historical arguments (Levesque2008).

Unfortunately, the literature on how to teach students to think historically does not often discuss the discourse features that students need to be able to access in order to comprehend and create historical arguments, specifically causation. Most of the studies exploring the impact of historical thinking instructional strategies provide students with graphic representations of causation without teaching them how to describe causal connections linguistically (e.g., Kemp2011; Rogers2011). When these studies do include linguistic instruction, they often focus on explicit causal signals that merge temporality and causality, such as exacerbated (e.g, “The sinking of the battleship exacerbated tensions and led to war”) and ultimately (e.g., “Tensions ultimately started the war”) (e.g., Waring2010). Studies that pair instruction about both historical thinking and the language of history are scarce.

Despite pedagogic efforts to shift history instruction from traditional, textbook-driven teaching to multiple-source historical thinking activities, the ways in which causation is discussed with students in both settings is eerily similar. The graphic representations that only imply causal relationships and the focus on explicit causal signals in historical thinking instruction are similar to the paratextual graphs and inclusion of causal connectors that textbooks use to aid students’ causal comprehension (Coffin2006). Indeed, when teachers use textbook passages to teach students how to identify, comprehend, and create causal connections, they use the same methods discussed above; teachers are only occasionally urged to focus on causal signals (e.g., Meyer and Poon2001; Williams et al.2007) or mapping causal events without explicit causal connections (e.g., Ciardiello2002). It appears that textbook editors and history education scholars of various pedagogic orientations tend to teach causation either graphically or with a limited set of explicit linguistic signals (e.g., because and so).

Unfortunately, these instructional strategies might not help all students access important causal connections between historical events. Reading researchers (e.g., Trabasso and van den Broek1985; Trabasso et al.1984; Warren et al.1979) and linguists (e.g., Noordman and de Blijzer2000; Schleppegrell and Achugar2003; Veel and Coffin1996) not only agree that causation is an important ordering concept for text comprehension but that variations on causal constructions impact readers’ mental representations of texts. In addition to neglecting instruction on (1) the impact of causal direction on comprehending historical texts (Noordman and de Blijzer2000) and (2) the use of CMPs in history texts (Achugar and Schleppegrell2005),a instructional studies also neglect to focus on implicit causal connections, such as CACs, that have been identified as troublesome for students’ comprehension of history texts (Fitzgerald2012) in history texts. In order to help all students identify, comprehend, and create sophisticated causal connections, they must be instructed in the various ways that causation is constructed.

Causal relationships

Despite calls for teachers to choose primary source texts to support history instruction, many teachers continue to use history textbooks as their primary instructional material (Nokes2010), making textbooks a primary means by which students are exposed to causal constructions. Research indicates that students are exposed to both explicit forms of causation, including causal conjunctions and CMPs (Achugar and Schleppegrell2005) as well as implicit forms, via cohesion and CACs (Fitzgerald2011). Instructing students to explore the ways that each form works is important to their understanding of historical text.

Explicit causal relationships

Causal conjunctions such as because, so, and as a result signal to readers that a causal connection is being made between two discrete events (Meyer and Poon2001; Williams et al.2007). Using connectors limits the number of causal connections that can be made with any particular event; connectors directly link two events to the exclusion of multiple causal factors. Often, when history teachers provide direct instruction for identifying causation, they teach these causal connectors. Here, teaching practice and textbook structure are mutually supportive in teaching a simplistic historical narrative (FitzGerald1979).

In addition to causal connectors, some verbs can also be used to explicitly realize causal relationships, such as cause and make. Unlike causal conjunctions that express causation between clauses, authors use CMPs to specify causal relationships within the clause structure, forming more densely constructed historical text that might be more difficult for students to comprehend. By examining verbs authors choose to realize specific processes, Achugar and Schleppegrell (2005) illustrate that causal connections can be made less explicit than if causal conjunctions were used, making an important case for exploring the various ways causation is expressed in history textbooks by looking beyond connectors.

Implicit causal relationships

Due to the breadth of history that they cover, history textbooks have the potential to describe complex situations where many events across time and space may influence a particular event. While dense nominal and verb-groups can make comprehending explicit causation more difficult (Achugar and Schleppegrell2005; Coffin2004), they can also enable authors to convey cause across the narrative (Tapiero et al.2002), expressing causation between sentences and even between paragraphs. Indeed, the more non-linear a narrative, the more likely it is that causation will be less direct (Coffin2004,2006). A historical narrative’s many actors, participants, situations, and circumstances reduce the likelihood that any one antecedent truly caused any one consequence. Thus, cohesion is one way that authors imply causal relationships across historical contexts (Beck et al.1989). For example, readers might recognize a causal connection between how the colonists rebelled against increased British taxes and the way that farmers reacted during the Whiskey Rebellion shortly after the American Revolution. While textbook authors might not make such a connection explicit, the similarities between these events suggest a causal relationship. By helping students to map connections across time, teachers enable students to identify cohesive causal connections and make them more explicit (Rogers2011).

Causal Asyndetic Constructions (CACs)

In contrast to the macro-level cohesive causal connections, CACs function between two clauses in a text; in these cases, authors could have chosen to employ causal connectors but did not. Specifically, CACs imply causation between two sequentially proximal sentences without an explicit link that would indicate such a relationship (Fitzgerald2012).

For example, one middle school history textbook writes of the rise of plantations in the lower United States, “Small landowners with just one or two slaves simply could not compete. Many gave up their land and moved westward” (Garcia et al.2005, p. 105). There is an implied causal relationship between these two sentences. The small landowners moved west because they could not compete with the plantation owners. The authors could have used a conjunction to explicitly connect these two sentences but they did not. Indeed, there are no connectors or explicit causal markers that illustrate cause-effect, though it is certainly implied. Since the relationship is not explicit, one cannot say that event ‘e’ directly caused result ‘r.’ Rather, a causal relationship is recognized between the two sentences by what is implicitly understood from the discourse.

The implied causal relationship between sentences such as these influences each sentence’s meaning-potential. On the one hand, the asyndetic sentences above are grammatically correct; they are independent of one another and stand alone as coherent thoughts. Since they exist independently and are located next to each other in the text, yet are not connected by any overt signals, these sentences are paratactic (equal in semantic weight). On the other hand, the “effect” sentence (the second one, in this case) does not exist independently from the first. As the above example illustrates, the small landowners would not have given up their land if they could have competed against the plantation owners. Conceptually, these sentences are hypotactic – one is subordinate to the other. Asyndetic constructions, then, are both paratactic and hypotactic in nature; grammatically, they are independent sentences but semantically one is subordinate to the other. Without explicit connectors, however, the hypotactic relationships are not signaled, sometimes making it difficult to determine the intended relationship between two sentences and certainly making it difficult to teach readers to make those contextual decisions. As Achugar and Schleppegrell (2005) note, “understanding the role of juxtaposition in the construction of causal reasoning and being able to recover the implicit connections is important for student readers” (p. 311). With regards to CACs, understanding the ways in which some juxtaposed sentences implicitly express causation is important to students’ comprehension, leading to better historical thinking within the history classroom.

Gohl (2000) identified three linguistic signals associated with speakers’ use of asyndetic constructions. By analyzing an adult, native-German speaker corpus, she determined that (1) prosodic design, (2) sequential proximity, and (3) modal particles all signaled asyndetic constructions. Of these three, prosodic design is not relevant to this current discussion because it examines how the intonation of what is being said effects the meaning of the statement. Here, written text is being examined. Sequential proximity is equally unhelpful when analyzing history textbooks because sentence proximity does not necessitate CACs, although it is a condition. Modal particles, however, may be relevant to identifying and explaining CACs in history textbooks.

Modality can be explored as a signal for CACs in history textbooks because it indicates the probability or “usuality” of propositions (Halliday and Matthiessen2004). A historical actor’s potential, probable, or usual action may influence his/her reality within the text. For example, the potential of success is an important consideration in determining whom a group should ally with, as in “Without French help, the Native Americans could not stop British settlers from moving on their lands” (p. 144)b. Similarly, the probability of success is a consideration; “[Destroying British boats] would cut off British communications with Charles Town” (Garcia et al.2005, p. 191). In both cases, modals realizing potentiality (e.g., could) and probability (e.g., would) encourage authors to explain why a particular event either turned out positively or negatively for a particular actor.

Although they have been identified in history textbooks, the frequency with which and the ways in which CACS are used have not been examined. This information would enable history educators to better understand if they should focus instructional time towards teaching students to identify them and, if so, how they might explain these implied constructions.

Design and method

In examining CACs in United States history textbooks, two questions were explored: (1) Do CACs occur in history textbooks with similar frequency to causal conjunctions and causal material processes (CMPs)? and (2) How is causal asyndetic cohesiveness signaled in history textbooks? In order to examine the role that these constructions play in the history textbook genre, two middle school and two high school United States history textbooks were selected. Informed by Coffin’s (2006) study of school history genres, secondary education texts were selected because causation is most likely to be expressed in texts designed for this developmental level. Causal explanations are sometimes lacking in the biographical, autobiographical and historical recount genres used in elementary social studies texts. Furthermore, United States history is the most often taught social studies topic in the United States (Evans2004), making an analysis of secondary United States history textbooks practically important.

Since secondary education covers a wide range of student cognitive and developmental capabilities, engaging students age 12 years to 18 years old, two middle school and two high school textbooks were analyzed. Using texts designed for students across this age range provides a perspective on linguistic structures in which a variety of students might engage. For consistent analysis, the content of the texts remained comparable because the subject of the texts were the same, even if the linguistic demands of the texts differed.

Two historical topics were selected for analysis from each text: (1) the American Revolution and (2) the Civil War. All four textbooks included sections about these topics and the chronological nature of the US History narrative was similar for each. These two topics were selected because they are ones to which students across the United States are frequently exposed. Thus, analysis of these topics holds an ecological relevance for instruction and learning in the K-12 history classroom.

Only main-text sentences were analyzed within the selected texts to decrease interpretive effects from paratext (charts, pictures, and primary source information). Direct quotations within the main texts were also disregarded, as were any connections made between the direct quotation and the sentences preceding and following the quotation. These decisions were made in an effort to better understand the constructions as written by the textbook authors and editors without the added syntactic and semantic difficulty of integrating the thoughts of historical figures.

Prior to analysis, possible CACs were identified and extracted from these selections. Once extracted, a broad “because and so” test was adopted to verify the causal relationship (Meyer2000) and to determine the direction of the causal expression (cause-to-effect or effect-to-cause) (Noordman and de Blijzer2000; Sanders2005). In other words, if it was logically possible to insert the words because or so between any two, sequential sentences that lacked causal markers, the construction was labeled ‘causally asyndetic’.

In order to compare the frequency of CACs with other more frequently studied forms of causal expression, CMPs realized by verbs such as made and forced (e.g., “Grant’s maneuver made Lee surrender”, “Lee forced Grant to retreat”, etc.) and casual conjunctions (e.g., “Lee surrendered because of Grant’s maneuver”, “Lee’s forces overwhelmed Grant so he retreated”, etc.) were identified within each history textbook. Frequency data was recorded and percentages per total number of words were calculated. Two chi-square analyses were also conducted to compare the frequency of CACs (1) between the texts and (2) within their grade-level categories, providing a description of how often they were used per authors and per grade-level.

Following these quantitative analyses, the CACs culled from the textbooks were qualitatively analyzed. Analysis began with Gohl’s (2000) findings about cohesive signals in verbal protocols; the use of modality in the asyndetic constructions was examined. Next, cases that remained were analyzed, focusing on the experiential processes construed by the textbook authors. Additional coding categories included mental, relational, and verbal processes.


A mixed-methods analysis of four United States history textbooks demonstrated that CACs occur as frequently, if not more frequently, than other more explicit forms of causation. In addition, CACs can be explained via mental, relational, and verbal processes or by modals, which can function similarly to these processes.

Do CACs occur in history textbooks with similar frequency to causal conjunctions and causal material processes?

The frequency with which causal constructions occur in United State history textbooks seems considerably less than their overall importance as a meaning-making structure. As Table 1 illustrates, both explicit (CMPs and conjunctions) and implicit (CACs) means of expressing causation are few in comparison to the total number of words per passage. Indeed, verbs such as forced, caused, and led were found in constructions such as “They helped to force France and Britain to aid the Confederate cause” (Garcia et al,2005, p. 468) and “This scream, later called the “rebel yell”, caused the Union troops to panic” (Garcia et al,2005, p. 469). These verbs realized material processes that made causation explicit for the reader. Causal conjunctions (e.g., because and so) were used in instances such as “Most children were taught to read so that they could understand the Bible” (Garcia et al,2005, p. 121). Using the methods described above, multiple forms of CACs were identified. Nevertheless, the data show that CACs occur in all four texts with similar, if not greater, frequency than the combined number of causal conjunctions and CMPs. Asterisks indicate that the number of tokens in a particular category comprise less that .001% of those in the sample.
Table 1

Frequency of causal constructions per textbook


Level of school

Causal material processes


Causal asyndetic constructions

Total number of words in passages



15 (.26%)

14 (.24%)

18 (.31%)


McGraw Hill


33 (.20%)

11 (0%)

28 (.17%)


Prentice Hall


35 (.24%)

13 (0%)

37 (.25%)


McDougal Little


46 (.25%)

38 (.21%)

52 (.28%)


Although there are differences between the total numbers of causal constructions expressed by any particular textbook, the percentage of tokens in each category is fairly consistent. For example, although differences were observed between instances of CMPs in the Holt and McDougal Little texts, their relative percentage of use per word is similar. These similarities occur not only within categories but between texts as well. Excluding the obvious outliers for 0% in the causal conjunctions category, the median percentage for frequency of use in all categories is .245% with a range from .17% to .31%. The percentages appear consistent amongst causal constructions and across texts.

CACs often occur more frequently than either CMPs or conjunctions as individual causal constructions within the sample. In only one case did the use of verbs realizing a CMP occur more frequently than CACs; there were five more instances of CMPs than CACs in the McGraw Hill text. In addition, textbook authors consistently used CACs more often than causal conjunctions. Again, though, this difference in frequency is not great (<.05%); no one form of causal expression is used with much greater frequency than another.

Disaggregating the data illustrates the distribution of these frequencies. Table 2 illustrates that the passages about the American Revolution express causation asyndetically more often than the Civil War passages. The latter passages use more CMPs. The results illustrated in Table 2 are not consistent throughout the textbooks.
Table 2

Frequency of causal constructions per textbook passage

Textbook passage

Causal material processes


Causal asyndetic constructions

Total words per passage

Holt – American Revolution

10 (.39%)

10 (.39%)

8 (.31%)


Holt – Civil War

5 (.16%)

4 (.13%)

10 (.32%)


McGraw-Hill – American Revolution

13 (.17%)

4 (0%)

20 (.25%)


McGraw-Hill – Civil War

20 (.23%)

7 (0%)

7 (0%)


Prentice Hall – American Revolution

11 (.12%)

7 (0%)

22 (.25%)


Prentice Hall – Civil War

24 (.43%)

6 (.11%)

9 (.16%)


McDougal Little – American Revolution

25 (.24%)

22 (.22%)

28 (.27%)


McDougal Little – Civil War

21 (.25%)

16 (.19%)

20 (.24%)


Like the cumulative data, the disaggregated data does not appear to follow any particular distribution pattern. A chi-square test for independence analysis confirms this observation. There is no significant relationship between text and causal expression, c 2(6, N = 329) = 9.22, p = .05. The authors’ use of CMPs, causal conjunctions, and CACs is similar across all texts.

Categorizing these texts into grade-level pairs yields a similar result. Again, there is no significant relationship between the grade-level of the text and the use of causal expression, c 2(2, N = 329) = 1.15, p = .05. The distribution of causal expressions in middle school texts is similar to the distribution in high school texts.

CMPs, causal conjunctions, and CACs are distributed similarly across all four textbooks. In three of the four textbooks, CACs are used more frequently than either CMPs or causal conjunctions, although this is dependent on the particular historical topic. When not the more frequently used constructions, CACs are the second most frequently used.

How is causal asyndetic cohesiveness signaled in history texts?

Gohl (2000) noted that modality signals asyndetic constructions in verbal discourse. Her findings serve as a point of departure for this qualitative analysis. Indeed, as illustrated in Table 3, 13% of CACs identified in the selected passages contained modals. An author’s choice of could or would realize a circumstantial potential by which historical actors make decisions.
Table 3

Distribution of signals for causal asyndetic constructions



Mental process

Relational process

Verbal process

Total # of asyndetic constructions


3 (17%)

8 (44%)

5 (28%)

2 (11%)



6 (21%)

20 (71%)

2 (7%)

0 (0%)


Prentice Hall

1 (3%)

21 (53%)

13 (35%)

2 (5%)


McDougal Little

7 (13%)

29 (56%)

13 (25%)

3 (6%)


All Texts

17 (13%)

78 (58%)

33 (24%)

7 (5%)



Ascribing potential agency to historical events allows textbook authors to make causal connections between events. In history texts, the modal could realizes the potential of an actor, group of actors, or event to change a circumstance. For example, the impact of the Tea Act on the colonial economy are explained as: “The Tea Act refunded four-fifths of the taxes the company had to pay to ship tea to the colonies, leaving only the Townshend Tax. East India Company tea could now be sold at lower prices than smuggled Dutch tea” (Appleby et al.2000, p. 65). Prior to this passage, the East India Company was struggling to match the prices of the tea that was being smuggled into the colonies.

The potential for lower prices, as indicated by could, was a direct result of the Tea Act. The Tea Act and lower prices did not happen in isolation from each other. If they had, the authors might have written, “The Tea Act refunded four-fifths of the taxes the company had to pay to ship tea to the colonies. East India Company tea sold at a lower price than smuggled tea.” This alternative construction would have indicated a temporal relationship; the juxtaposition of these sentences suggests then might be an appropriate connector. Rather, through the inclusion of could, the authors indicate that the British Parliament was acting for the benefit of the East India Company, providing a potential situation that they could exploit for profit and implying a causal relationship.

The use of would also indicates a causal relationship. This modal, however, expresses the predictive likelihood of a situation as in, “Although he failed to capture Petersburg, a rail center south of Richmond, he began a siege of the city. This siege would cut supplies to the Confederate capital” (Ayers et al.2009, p. 130). General Grant, the “he” in the passage, predicted that isolating Richmond’s main supply railway would likely starve the city of supplies. Thus, he first tried to capture Petersburg; failing that, he laid siege to the city. Grant’s actions were not based on fact, for he did not know if the siege would affect the supply lines into Richmond. By using would, the authors suggest that Grant’s actions were based on a predicted result. Otherwise, they might have written, “This siege cut supplies to the Confederate capital”, suggesting an explicit causal connection.

Across all four texts, modality: potential were used more frequently than modality:predictive. Of the eleven instances of potentiality, two specific modals were used: could and might. In contrast, only one predictive modal, would, was used in six instances. Thus, while both types of modals are used to form the same implied causal construction, modality:potentiality were expressed by more variant structures than modality: predictive.


More commonly than modals, however, CACs were constructed by using specific verbs to realize non-material processes, such as mental, verbal, and relational processes. In these cases, authors’ used one or more verbs to construe “a quantum of change in the flow of events taking place in our own consciousness” (Halliday and Matthiessen2004, p. 197). These “quantums of change” explained either the antecedent (“cause”) or consequence of the implied cause-effect relationship, often by describing a historical actors’ internal state. That is, by explaining a historical actors’ mind-set, condition, or claims, authors were able to imply the reason for a consequent action. Specifically, mental [e.g., “Soon after Washington’s return, the British government decided it had to push the French out of the Ohio River valley. In 1755, it sent General Edward Braddock to Virginia with orders to capture Fort Duquesne” (Davidson and Stoff2007, p. 142)], relational [e.g., “The Battle of Quebec was the turning point of the war. When Montreal fell the next year, all of Canada was in British hands” (Garcia et al.2005, p. 134)], and verbal processes [e.g., “With their assemblies outlawed, some colonists refused to pay taxes. They said that being taxed without having a voice in government violated their rights” (Garcia et al.2005, p. 147)] were used to imply such causation. Each of these instances will be explained below and, in certain cases, contrasted with other processes concurrently identified in the texts.

Mental processes

Rather than causally relating events through physical action, mental processes enable authors to connect historical events to historical actors’ mind-sets. While mental processes are internal to an individual or group, they can be illustrated in causal relationships, similar to the ways in which cause is realized through modality. Indeed, Halliday and Matthiessen (2004) argued that mental processes can serve as “metaphors of modality” (p. 208), since they illustrate internal potential for external action. In other words, “sensing” accounts for historical actors’ potential or predictive actions. Four types of sensing signal CACs involving mental processes: cognition, emotion, desire, and perception (Table 4).
Table 4

Frequency of use for four types of mental process causal asyndetic constructions











McGraw Hill





Prentice Hall





McDougal Little











Processes of cognition describe historical actors’ thoughts, motivating particular actions. For example, when discussing General Braddock’s attack on the French at Fort Duquesne prior to the French and Indian War, textbook authors wrote, “Soon after Washington’s return, the British government decided it had to push the French out of the Ohio River valley. In 1755, it sent General Edward Braddock to Virginia with orders to capture Fort Duquesne” (Davidson and Stoff2007, p. 142). By constructing these sentences in this way, the authors signal that the British government, the actor in the first sentence, intentionally ordered Braddock to capture Fort Duquesne, following Washington’s defeat. The reason for the British government’s decision is realized in its role as sensor of cognition. The cognition of the British government “caused” Braddock’s attack on Fort Duquesne, signaling readers to the implied causal connection.


Processes of cognition are not the only mental processes that were used to signal CACs, however. The authors also used emotive processes to explain why events occurred, as illustrated by “feared” in “Many leading merchants and large landowners were Loyalists. They feared a rebellion would lead to a change in government and that they would lose their property” (Davidson and Stoff2007, p. 157). Rather than the cognitive mental process used to describe the British government’s action, this CAC relies on the emotive power of “fear” to describe a causal relationship between the merchants’ reality and possible outcomes of rebellion in the colonies. Strong emotions such as “fear” elicit action (or reaction), implying a causal relationship between the antecedent and the consequence.


In addition to mental process CACs expressing emotive causation, textbook authors also used desideration to imply causal links. Rather than using emotions to signal causal connections, desideration verbs such as “want” and “hope” allow authors to tie causal events to an actor’s desires. For example, to describe the desired result of the post-Boston Tea Party conciliation, Garcia et al. (2005) wrote, “Britain rejected the offer. It not only wanted repayment but it also wanted the men who destroyed the tea to be brought to trial” (p. 151). Rather than expressing an emotion or a thought, Britain is portrayed as having a desire. The specifics of this desire, as explained in the second sentence, are predictive of the result, a rejection of the colonists’ peace. Thus, the wants and hopes of historical actors play a role in detailing the reasonableness of their actions and explain the cause of their decisions.


Yet another example of how various mental processes can be used to signal causation is in the use of perception. Often, perception is directly experiential; seeing, hearing, feeling, etc. are all processed by the brain directly from real-world experience. Indeed, these direct experiences can cause action. Individual actors can also metaphorically sense, however, as in “Most of the British army was in New York, and New York saw that as an unfair burden. Its assembly refused to pay to house the troops” (Garcia et al.2005, p. 147). The authors used “saw” to blur the boundaries between perception and cognition; the State of New York did not see an unfair burden. Yet, the authors use this verb metaphorically to convey perception and signal a causal connection. By “seeing” the reality of the political and economic situation, New York was enabled to justifiably refuse the quartering of troops.

Relational processes

Besides mental processes (and the four types of sensing), relational processes were also used to imply causation. Relational processes signal causal asyndetic cohesiveness because they make claims for which the authors must account in their explanations. Using identifying verbs such as is, represents, and means, authors create a Token/Value relationship in one clause/sentence. Another clause/sentence is often needed to explain that relationship, implying causation.

For example, Garcia et al. (2005) described the Battle of Quebec this way: “The Battle of Quebec was the turning point of the war. When Montreal fell the next year, all of Canada was in British hands” (p. 134). The Battle of Quebec [token] represents the turning point [value] and this claim needs substantiation; historical turning points are in frequent debate. Here, the authors choose to employ a CAC to explain their claim, implying Montreal’s related fall to the British as a significant political and military consequence of the Battle of Quebec.

Verbal processes

Still a third process was used to signal implicit causal connections, verbal processes. Although they only comprised a small percentage of the total CACs found amongst the text samples, verbal process CACs served a specific purpose in the selected texts; all instances of CACs signaled by verbal processes were related to the speech of historical actors. For example, following the dispute between the colonists and the British government over taxation, the colonists began refusing to pay taxes: “With their assemblies outlawed, some colonists refused to pay taxes. They said that being taxed without having a voice in government violated their rights” (Garcia et al.2005, p. 147). In cases such as this, the authors blur the lines between citation and cognition. There is no documentation, for example, that the colonists said those words. Rather, it is more likely that the colonists generally thought that taxation without representation was unfair. Like the example of CAC signaled by cognitive mental process above, then, these verbal process CACs use the link between thought and action to imply causal relationships between events.


Figure 1 illustrates the delicacy of the CACs found within the textbook passages. The numbers following each category indicate the frequency with which they occurred. Textbook authors used modality to construct implied causal relationships, like Gohl (2000) found in her verbal discourse analysis. In addition, mental, relational, and verbal processes were also used to form CACs, signaling implied causal relationships. Mental process CACs far outnumber other types, accounting for 58% of the total. Indeed, one subtype from this category, cognition, had more tokens than any of the three major types of CACs.
Figure 1

Delicacy of causal asyndetic constructions in textbook passages.


Textbooks express causation using a variety of explicit and implicit means. Authors frequently use CMPs and conjunctions to explicitly express causation (Achugar and Schleppegrell2005). In addition, they also use CACs to imply causation (Fitzgerald2012). This study demonstrates that CACs are used as frequently, if not more frequently, than CMPs and causal conjunctions in sample United States history textbooks. Such causation is signaled through the use of modality, mental processes, relational processes, and verbal processes.

Possible reasons for causal asyndetic constructions

There are four possible explanations for why history textbook authors employ CACs. One reason relates to historical content. History textbook authors intentionally develop unified, nation-state narratives free of contentious views (FitzGerald1979; Moreau2004; O’Leary1999; Zimmerman2002). No matter how unified (some say “white-washed”) these narratives are, however, conflict amongst historical interpretations cannot always be completely ironed out of the narrative. Whether because of (1) a lack of historical evidence, (2) varied interpretations, (3) political sensibilities, or (4) a combination thereof, relationships between historical events are not always clear. Thus, there are times when textbook authors surely have to hedge, making implied causal links rather than explicit ones.

For example, it seems logical that General Grant laid siege to Petersburg because he wanted to cut Confederate supply lines, but this is only one possible explanation. He might have also thought that President Lincoln would fire him if he withdrew his forces, as Lincoln did earlier with General McClellan. Unless textbook authors have evidence to support the implied causal connections, which they rarely provide, CACs may be a symptom of insufficient historical evidence.

It could also be the case that the frequency of casual asyndetic constructions is higher in texts like history textbooks, where authors are forced to condense many historical facts into a specified space; indeed, textbook authors have often complained about such constraints (cf. Brinkley et al.2005). If this is the case, CACs may be a phenomenon of condensing causal cohesive ties that would normally be spread across a wide text-space. In other words, textbook authors may use CACs in the constrained space of the textbook when they would normally explain how a causal relationship developed between events over a paragraph or chapter.

A third reason why textbook authors employ CACs relates to authorial voice and interpretation. Indeed, it is possible that authors use CACs to add their own voice to texts traditionally admonished for not displaying the interpretive nature of history (Apple2000; Epstein1994; Loewen1995). When authors use CACs, they signal to readers that the causal relationship between two events is not direct. Rather, as demonstrated in this study, many of the CACs refer to a historical actor’s internal mind, something probably not known to too many authors. Thus, authors may intentionally use these constructions to approximate interpretive dialogue with readers.

Yet a fourth explanation might simply be that CACs are a common discourse feature in history texts. This study is limited to a small sample of history textbooks; it is certainly possible that other historical narratives routinely use CACs as well. The use of CACs in history texts might be just one example of the many ways that language can be used to convey meaning, specifically causation. Explorations into other forms of historical narratives might confirm this explanation.

These explanations are not mutually exclusive, either. The use of CACs in history textbooks may be a symptom of a combination of these reasons. Unfortunately, both possibilities were outside the scope of this study. Interviews with textbook authors may help to clarify why CACs are used. In addition, further studies examining CACs in a larger sample of United States history textbooks, other school-based texts, and other historical narratives may clarify their communicative purpose.

Implications for teaching

Since CACs only imply causation, readers must infer the relationship between the sentences. If the relationship is inferred incorrectly, a reader’s comprehension of the passage will suffer. Reading research suggests that a reader’s ability to make the correct inference is related to his/her general ability as a reader (Beck et al.1989; McKeown et al.1992; McNamara et al.1996). That is, better readers will probably make the inferences intended by the author; poorer readers might not. In order to help all students comprehend historical texts better, teaching students to identify and explain how causation is constructed may help their comprehension and writing.

In addition to teaching students to identify causal conjunctions (Williams et al.2007) and CMPs (Achugar and Schleppegrell2005; Schleppegrell et al.2004), these data demonstrate that United States history teachers should also teach students how to identify and make meaning from CACs; CACs account for a large number of total causal constructions in United States history textbooks. In doing so, teachers will enable students to comprehend and create a wider variety of causal relationships.

In order to teach students to recognize CACs, teachers can use three explanations. Teachers might first want to begin by explaining how CACs are developed through mental and verbal processes, since these make up the majority of CACs. Instructing students to pause whenever an author suggests that a historical actor thought, felt, or said something and look for ways in which those thoughts and feelings may have impacted historical events, students will be able to better recognize implied causal relationships between individual psychologies and physical events.

Similarly, teachers might suggest that students pause whenever they encounter modals. This approach marries the “look for” approach advocated for teaching causal conjunctions and the “look around” approach one might use for comprehending mental and verbal process CACs. When students encounter words like would or could, they should ask themselves if the possibility implied in that clause was realized in a physical action. If so, then it is likely that a CAC is present.

Relational process CACs may be the most difficult to explain because students must understand the Token/Value relationship between events; another way of explaining this relationship might be through the Claim/Evidence relationship between ideas. Helping students to understand that Token/Value relationships must be supported by evidence is both important for their understanding as well as their writing. Intentionally asking students to identify claims within a text might help them to explore how causal relationships support Token/Value relations.


As this study illustrates, the ways in which causation is expressed in history textbooks extends beyond the causal conjunctions and CMPs so often used to teach students how causation is expressed. Although these more explicit forms are important, teachers must understand the ways in which processes are realized within the text structure, sometimes signifying a causal connection, since these causal structures occur frequently within history textbooks. In order to enact such instruction, history teachers in particular need to understand the disciplinary ways in which language constructs meaning (Coffin2004; Schleppegrell2004), illustrated through this study’s examples. Findings suggest that history teachers’ focus on content area literacies needs to extend beyond techniques for understanding the words in a particular text to explore the ways in which language realizes meaning.


aAlthough Achugar and Schleppegrell (2005) do not refer to the causal process verbs in their study as Causal Material Processes (CMPs), all of the verbs used in the more explicitly causal passages in this study realized material processes (e.g., forced and make). I use the term CMP throughout this paper to differentiate the more explicit material processes from the more implicit processes that construct causal asyndetic constructions (CACs), explained later in this study.

bUnless otherwise noted, all italicized words within direct quotes are added for emphasis and clarity of explanation.

Author’s contributions

JCF is solely responsible for conceiving this study, collecting texts, coding samples, conducting the proper analyses, and writing this manuscript.

Author’s information

JCF is an assistant professor in Wagner College’s Department of Education. He teaches pre-service social studies teachers, where he routinely helps them select texts from which to teach US history content.



Causal asyndetic construction


Causal mental process.




Authors’ Affiliations

Wagner College


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