Unit 7.9 — Causation in Global Conflict
Topic 7.9 closes Unit 7 with the synthesis skill: sorting political vs. economic causes, ranking their relative significance, and tracing a single continuous causal chain from WWI's unresolved grievances through the interwar period to WWII rather than treating them as separate events.
Topics 7.1–7.8 built up every piece of Unit 7 separately: shifting power, two world wars each with their own causes and conduct, an interwar economic collapse, betrayed self-determination, and mass atrocities. Topic 7.9 closes the unit exactly the way Topic 6.8 closed Unit 6 — with a synthesis skill rather than new content: ranking the relative significance of Unit 7's many causes rather than simply listing them.
Two categories of cause worth sorting first
Before ranking significance, organize Unit 7's causes into two useful buckets. Political causes include nationalism (Topics 5.2, 6.1, 7.1, 7.2), the alliance systems (Topic 7.2's Triple Entente/Alliance and Topic 7.6's Axis), the pre-war arms race (Topic 7.2's militarism), and imperial rivalry (Topic 6.1's competition carrying directly into Topic 7.2). Economic causes include competition for markets and colonial resources (Topic 6.4–6.5) and the Great Depression's global reach (Topic 7.4). Sorting a cause into one of these categories before writing is itself useful essay structure — it shows the grader you're organizing evidence deliberately rather than listing facts at random.
The core skill: ranking, not just listing
A weak synthesis answer names several causes and stops. A strong one explicitly ranks them and defends the ranking with reasoning — for example, arguing that the unresolved economic and territorial grievances from World War I (Topics 7.4–7.5) mattered more for causing World War II than any single new factor, because they directly explain why fascism found an audience (Topic 7.6) in a way that no cause unique to the 1930s alone could. The specific reasoning behind a ranking, not the ranking itself, is what earns credit.
Tracing continuity between the two wars
The most powerful move available in this topic is showing that World War I and World War II were not two isolated events but were connected by shared underlying causes running continuously through the interwar period: the unresolved reparations and debt structure from Topic 7.4, the betrayed self-determination promises of Topic 7.5, and the persistence of aggressive nationalism (Topic 7.2 into Topic 7.6) all bridge the two conflicts directly. A causation essay that treats 1918–1939 as a single connected chain, rather than as "war ends, unrelated new war begins twenty years later," demonstrates exactly the synthesis this topic tests.
Broader forces beyond the two wars themselves
The exam also wants this topic connected to larger patterns running through the whole course: rapid technological change (Topic 5.5 into Topic 7.3's weapons and Topic 7.7's atomic bombs), the collapse of land-based and maritime empires (Topic 7.1's Ottoman and Qing collapse, itself the endpoint of empires tracked since Unit 3), revolutionary movements (Topic 5.2's precedent, echoed in the ideological competition between fascism and communism), and mass atrocity as a consequence rather than merely a side effect of these political and economic causes (Topic 7.8).
Why this matters for the exam
Topic 7.9 is a study guide for the causation and synthesis skills this whole unit built toward: name specific causes from across Topics 7.1–7.8, sort them into political and economic categories, explicitly rank which mattered most and explain why, and — the strongest possible move — trace a single continuous causal thread connecting World War I through the interwar period to World War II rather than treating them as separate topics. This mirrors exactly the causation skill Topic 6.8 trained on imperialism, now applied to the century's two world wars.
Sources: Fiveable — Causation in Global Conflict.