Review AP World Unit 7 to understand how global conflicts from World War I through the Cold War reshaped empires, economies, and ideologies across the twentieth century. This unit covers the causes and conduct of both world wars, interwar instability, mass atrocities, and the long-term consequences of unprecedented violence.
Fiveable's AP World History: Modern Unit 7 review covers 9 topics, with guided practice questions for the unit.
Use the topic guides, key terms, practice questions, SAQs, FRQs, and AP score calculator available for this unit to focus your review.
Unit 7 covers the most destructive century in recorded history. The Ottoman, Russian, and Qing empires collapsed under internal and external pressure, opening space for revolutionary governments and new states. Imperialist competition, a tangled alliance system, and intense nationalism ignited World War I. The flawed peace settlement, the Great Depression, and the rise of fascist regimes then produced World War II. Both wars were total wars in which governments mobilized entire societies using propaganda, conscription, and new military technology. The interwar and wartime periods also produced mass atrocities including the Holocaust, the Armenian Genocide, the Holodomor, and later the Cambodian and Rwandan genocides.
Unit 7 is about why and how global conflicts erupted after 1900, how governments fought them, and what patterns of atrocity and instability they left behind. The core skill is causation: explaining which factors mattered most and why.
The Ottoman, Russian, and Qing empires all fell by the early twentieth century under combinations of military defeat, internal reform failures, nationalist pressure, and economic strain. Russia's collapse led directly to the Bolshevik Revolution and Soviet state. The Qing fell in the 1911 Revolution, and the Mexican Revolution challenged political order in Latin America at the same time.
Both WWI and WWII required governments to mobilize entire populations, not just armies. Propaganda, conscription, rationing, and colonial troop recruitment all served the war effort. New technology, from machine guns and poison gas in WWI to blitzkrieg tactics and atomic bombs in WWII, drove casualties to unprecedented levels.
The Great Depression forced governments toward intervention: the New Deal in the US, Five Year Plans in the USSR, and fascist corporatist economies in Italy and Germany. Unresolved territorial tensions and the rise of extremist regimes produced mass atrocities including the Holocaust, the Holodomor, and the Armenian Genocide, establishing a grim pattern repeated in Cambodia and Rwanda.
The AP exam asks you to explain the relative significance of causes of global conflict from 1900 to the present. No single factor explains WWI or WWII. Militarism, alliance systems, imperialism, nationalism, economic crisis, and unresolved territorial grievances all interacted. The skill is building a defensible argument about which causes mattered most and why, using specific evidence from across the unit.
The Ottoman, Russian, and Qing empires collapsed under internal weaknesses and external pressures. Russia's collapse produced the Bolshevik Revolution. The 1911 Revolution ended Qing rule. The Mexican Revolution challenged political order in Latin America.
Militarism, a flawed alliance system, imperial competition, intense nationalism, and the assassination of Archduke Franz Ferdinand combined to turn regional Balkan tensions into a global war in 1914.
WWI was the first total war. Governments used propaganda, conscription, and colonial mobilization to sustain the conflict. New technology including machine guns, poison gas, and tanks drove unprecedented casualties.
The Great Depression forced governments to intervene in economies. Responses ranged from the US New Deal to Soviet Five Year Plans to fascist corporatism in Italy and Germany, reflecting different political ideologies.
Western and Japanese empires maintained colonial control after WWI, gaining new territories through League of Nations mandates and conquest. Anti-imperial resistance grew through organizations like the Indian National Congress and West African strikes.
WWII resulted from the flawed Versailles settlement, the Great Depression, continued imperial ambitions, and the rise of fascist regimes, especially Nazi Germany's aggressive militarism under Adolf Hitler.
WWII was a total war in which democracies and totalitarian states alike mobilized entire populations using propaganda and ideology. New tactics including blitzkrieg, firebombing, and atomic weapons drove civilian casualties to catastrophic levels.
Extremist regimes produced systematic mass killings including the Holocaust, Armenian Genocide, Holodomor, Cambodian Genocide, and Rwandan Genocide. The Nuremberg Trials established international accountability for crimes against humanity.
This synthesis topic asks you to rank the relative significance of causes of global conflict from 1900 to the present, connecting militarism, nationalism, economic crisis, ideology, and unresolved tensions into a defensible argument.
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Review Unresolved Tensions After World War I with attention to how the concept appears in AP-style source and evidence questions.
Review Causes of World War I with attention to how the concept appears in AP-style source and evidence questions.
Review Economy in the Interwar Period with attention to how the concept appears in AP-style source and evidence questions.
Review Shifting Power After 1900 with attention to how the concept appears in AP-style source and evidence questions.
At the start of the twentieth century, Western powers dominated global politics, but land-based empires were already under severe stress. The Ottoman, Russian, and Qing empires each collapsed under a combination of internal weaknesses and external pressures, producing new states and revolutionary governments by the 1920s.
Can you explain two internal and two external factors that contributed to the collapse of one land-based empire after 1900?
| Empire | Key internal factor | Key external factor | Outcome |
|---|---|---|---|
| Ottoman | Nationalist separatism among subject peoples | Military defeats in Balkan Wars and WWI | Dissolved; successor states created |
| Russian | Worker and peasant unrest, food shortages | Military collapse in WWI | Bolshevik Revolution; Soviet state |
| Qing | Reform failures, Han nationalism | Foreign imperialism and unequal treaties | 1911 Revolution; Chinese Republic |
WWI broke out in 1914 because multiple long-term pressures converged with a short-term trigger. The MANIA framework captures the main causes: Militarism, Alliance system, Nationalism, Imperialism, and Assassination. No single cause is sufficient; the AP exam expects you to weigh their relative significance.
Which cause of WWI do you think was most significant, and what evidence supports that argument?
WWI introduced the concept of total war: governments mobilized entire societies, including colonial populations, to sustain the conflict. Propaganda, censorship, conscription, and war bonds kept home fronts committed. New military technology made the war far deadlier than any previous conflict.
How did governments use propaganda and colonial mobilization to sustain WWI, and what were the consequences for colonial peoples?
The Great Depression beginning in 1929 forced governments worldwide to abandon laissez-faire economics and intervene directly in their economies. Different political systems responded in very different ways, but all expanded state power over economic life.
Compare how two different governments responded to the Great Depression. What does the comparison reveal about the relationship between economic crisis and political ideology?
| Country | Government type | Economic response | Key policy |
|---|---|---|---|
| United States | Liberal democracy | Keynesian spending and regulation | New Deal |
| Soviet Union | Communist state | Total state control and industrialization | Five Year Plans |
| Germany/Italy | Fascist regimes | Corporatist state-directed economy | Fascist corporatism |
| Brazil/Mexico | Nationalist popular governments | Economic nationalism and state investment | Vargas/Cardenas reforms |
The post-WWI settlement did not dismantle Western or Japanese empires. Colonial peoples who had supported the war effort found their demands for self-determination ignored. New territorial arrangements through League of Nations mandates extended imperial control under a different name, while anti-imperial resistance grew.
What evidence shows that the post-WWI settlement maintained rather than dismantled imperial control? What evidence shows that resistance was growing?
WWII grew directly from WWI's unresolved problems. The unsustainable Versailles settlement, the Great Depression, continued imperial ambitions, and the rise of fascist regimes combined to produce a second global conflict. Like WWI, WWII was a total war, but ideology played a more explicit role in mobilization and repression.
How did the conduct of WWII differ from WWI in terms of technology, ideology, and civilian impact?
| Feature | World War I | World War II |
|---|---|---|
| Key new technology | Machine guns, poison gas, tanks | Atomic bomb, firebombing, blitzkrieg |
| Mobilization method | Propaganda, conscription, colonial troops | Propaganda, ideology, total economic control |
| Role of ideology | Nationalism and imperial loyalty | Fascism, communism, and democracy explicitly opposed |
| Civilian casualties | High but mostly indirect | Massive, including deliberate targeting of cities |
Extremist regimes and ethnic nationalist movements produced systematic mass killings across the twentieth century. The AP exam expects you to know multiple cases, explain their causes, and understand their consequences for international law and human rights norms.
What common causes appear across multiple twentieth-century genocides? What consequences did these atrocities have for international law?
| Atrocity | Perpetrator | Victims | Approximate period |
|---|---|---|---|
| Armenian Genocide | Ottoman government | Armenians | 1915-1923 |
| Holodomor | Soviet government under Stalin | Ukrainians | 1932-1933 |
| Holocaust | Nazi Germany | Jews and others | 1941-1945 |
| Cambodian Genocide | Khmer Rouge | Intellectuals, minorities | 1975-1979 |
| Rwandan Genocide | Hutu extremists | Tutsi and moderate Hutu | 1994 |
Topic 7.9 is a synthesis skill topic, not a new content block. It asks you to rank and explain the relative significance of causes of global conflict from 1900 to the present. You are connecting militarism, alliances, imperialism, nationalism, economic crisis, and unresolved tensions into a defensible argument about which mattered most and why.
Write a thesis that argues for the relative significance of one cause of global conflict from 1900 to the present, using evidence from at least two different conflicts.
Try AP-style multiple-choice questions and written prompts after you review the notes.
A timed, AP-style test built only from unit 7 questions — multiple choice plus free response, scored with AI feedback. Use the standard format or build your own.
| Term | Definition |
|---|---|
| Total War | A conflict in which governments mobilize entire societies, including economies, civilians, and colonial populations, to sustain the war effort, as seen in both WWI and WWII. |
| Alliance System | The network of mutual defense treaties between European powers before WWI, including the Triple Entente and Triple Alliance, that turned the assassination of Franz Ferdinand into a global war. |
| Bolshevik Revolution | The October 1917 seizure of power by Lenin's Bolsheviks in Russia, establishing a communist state after the collapse of the tsarist government under the pressures of WWI. |
| Great Depression | The severe global economic collapse beginning in 1929 that caused mass unemployment, destabilized democratic governments, and created conditions for fascist movements to gain power. |
| Five Year Plans | Stalin's centralized Soviet economic programs beginning in 1928 that rapidly industrialized the USSR through state control, collectivized agriculture, and repressive enforcement. |
| Fascism | An authoritarian nationalist ideology that used state control of the economy, suppression of opposition, and aggressive militarism, as practiced by Mussolini in Italy and Hitler in Nazi Germany. |
| League of Nations mandates | A post-WWI system in which former German colonies were assigned to Britain and France as trustees, extending imperial control under League supervision rather than granting independence. |
| Holocaust | The Nazi regime's systematic murder of six million Jews and millions of others through concentration camps, mass shootings, and gas chambers during WWII. |
| Armenian Genocide | The Ottoman government's systematic deportation and killing of approximately 1.5 million Armenians during and after WWI, recognized as one of the first modern genocides. |
| Holodomor | The man-made famine in Soviet Ukraine from 1932 to 1933 caused by Stalin's forced collectivization and grain confiscation policies, killing millions of Ukrainians. |
| Atomic Bomb | A nuclear weapon used by the United States against Hiroshima and Nagasaki in August 1945, ending WWII in the Pacific and introducing nuclear weapons as a permanent feature of global power politics. |
| Propaganda | Government-produced media, posters, and messaging used in both WWI and WWII to build nationalist support, recruit soldiers, justify war aims, and sustain civilian commitment to the conflict. |
| Mexican Revolution | The armed conflict beginning in 1910 that overthrew Porfirio Diaz's dictatorship and produced demands for land reform, workers' rights, and political democracy in Mexico. |
| Khmer Rouge | The radical communist regime under Pol Pot that ruled Cambodia from 1975 to 1979 and killed approximately 1.7 million people through forced labor, starvation, and executions. |
The assassination was the trigger, not the root cause. The AP exam expects you to explain the underlying structural causes: militarism, the alliance system, imperial competition, and nationalism. The assassination only mattered because those pressures already existed.
Both were total wars, but WWII involved explicit ideological mobilization through fascism and communism, deliberate targeting of civilians through firebombing and atomic weapons, and a much larger role for totalitarian repression. Do not describe them as identical.
Topic 7.8 requires knowledge of multiple cases: the Armenian Genocide, Holodomor, Cambodian Genocide, and Rwandan Genocide are all explicitly listed. Exam questions may ask you to compare cases or explain patterns across them.
Mandates transferred former German colonies to Britain and France under League supervision. This was a continuation of imperial control, not independence. Anti-imperial resistance grew precisely because colonized peoples recognized this distinction.
Topic 7.9 is not just a review of facts. It asks you to argue about relative significance, meaning you need to compare causes and explain why one mattered more than others. Practice building a thesis that makes a defensible claim, not just a list.
AP World History frequently asks you to explain causes of major events and argue which cause was most significant. For Unit 7, this means building thesis statements that compare militarism, nationalism, economic crisis, and imperial competition as causes of WWI or WWII, then supporting the argument with specific evidence. Topic 7.9 is explicitly a causation skill topic, and SAQ and LEQ prompts in this unit often ask you to evaluate which factor mattered most rather than simply list causes.
The learning objective for Topic 7.7 explicitly asks you to compare how governments conducted war, making comparison a likely task type for this unit. You may be asked to compare WWI and WWII mobilization methods, compare democratic and totalitarian states' approaches to total war, or compare economic responses to the Great Depression. Practice identifying similarities and differences with specific evidence rather than general statements.
Topic 7.5 centers on the continuity and change reasoning skill applied to territorial holdings from 1900 to the present. Exam tasks may ask you to explain what changed and what stayed the same in imperial control after WWI, using evidence like League of Nations mandates as continuity and anti-imperial resistance movements as change. Connecting Unit 7 patterns to Unit 8 decolonization strengthens continuity and change arguments across the 1900-present period.
Use this checklist to confirm you can handle every major idea in Unit 7 before exam day.
Identify at least two internal and two external factors that caused the Ottoman, Russian, or Qing empire to collapse, and connect the Russian collapse to the Bolshevik Revolution.
Explain how militarism, the alliance system, nationalism, imperialism, and the assassination of Franz Ferdinand each contributed to WWI, and practice ranking their relative significance.
Describe how governments in WWI and WWII used propaganda, conscription, and colonial mobilization, and explain how new military technology changed the scale of casualties in each war.
Contrast the New Deal, Soviet Five Year Plans, and fascist corporatism as responses to the Great Depression, noting how each reflected the political ideology of its government.
Explain how League of Nations mandates extended imperial control after WWI and identify specific examples of anti-imperial resistance such as the Indian National Congress and West African strikes.
Be able to name the perpetrators, victims, approximate period, and at least one cause and one consequence for the Armenian Genocide, Holocaust, Holodomor, Cambodian Genocide, and Rwandan Genocide.
Write or outline a thesis that argues for the relative significance of one cause of global conflict, using evidence from at least two different conflicts covered in Unit 7.
Read the 7.1 topic guide and create a three-column chart listing internal factors, external factors, and outcomes for the Ottoman, Russian, and Qing empires. Add the Mexican Revolution as a fourth case. This builds the foundation for understanding why the global order was already unstable before WWI.
Review the 7.2 and 7.3 topic guides together. Use the MANIA framework to organize WWI causes, then list specific examples of total war mobilization: propaganda campaigns, colonial troop recruitment, and new technology like poison gas and machine guns. Practice explaining how these factors interacted.
Use the 7.4 topic guide to build the comparison table of economic responses to the Great Depression. Then review 7.5 to map which empires gained territory through mandates and which faced anti-imperial resistance. Connect these two topics: economic crisis and unresolved imperial tensions both fed the causes of WWII.
Review 7.6 and 7.7 together using the WWI vs. WWII comparison table. Then work through 7.8 by creating a reference chart of all five mass atrocity cases with perpetrators, victims, period, and one cause and consequence each. Use the 7.8 topic guide to check your examples.
Use the 7.9 topic guide to practice the causation skill. Write two or three thesis statements arguing for the relative significance of different causes of global conflict, then test them against the evidence from your earlier study steps. Use available SAQ and FRQ practice to apply this skill under timed conditions.
Open the individual guides for Unit 7 when you want a closer review of one topic.
Use AP-style practice after you review the notes so you can check what you understand.
Practice free-response reasoning and compare your answer with scoring guidance.
Watch past review streams filtered to Unit 7 when you want a video walkthrough.
Open the Fiveable one-page unit review, then explore visual cheatsheets for a quick refresher.
Estimate your broader AP score goal after you review the course and exam format.
Print the unit cheatsheets ($3) for Unit 7. Yours to keep, no subscription needed.
get printablesAP World Unit 7 covers 9 topics on global conflict from 1900 to the present: Shifting Power After 1900, Causes of World War I, Conducting World War I, The Economy in the Interwar Period, Unresolved Tensions After World War I, Causes of World War II, Conducting World War II, Mass Atrocities After 1900, and Causation in Global Conflict. The unit traces how two world wars, economic collapse, and rising ideologies reshaped borders and international power. See the full topic breakdown at /ap-world/unit-7.
AP World Unit 7 makes up 8-10% of the AP exam, covering global conflict from 1900 to the present. That includes the causes of World War I, the causes of World War II, how both wars were conducted, the interwar economy, mass atrocities, and the shifting power dynamics that set the stage for modern geopolitics.
The AP World Unit 7 progress check includes both MCQ and FRQ parts drawn from all 9 topics in the unit. Multiple-choice questions test your ability to analyze sources and arguments on topics like the causes of World War I, conducting World War II, shifting power after 1900, and mass atrocities. The FRQ portion typically asks you to construct an argument or contextualize evidence from those same topics. Practicing with questions matched to each topic before you take the progress check makes a real difference. You can find unit-aligned practice at /ap-world/unit-7.
AP World Unit 7 FRQs most often draw from high-stakes topics like the causes of World War I, the causes of World War II, conducting World War I and II, and mass atrocities after 1900. The question types you'll see are Document-Based Questions (DBQs), Long Essay Questions (LEQs), and Short Answer Questions (SAQs), all of which ask you to use evidence and build an argument. To practice effectively, outline responses to past prompts on these topics, focus on contextualization and thesis writing, and review your reasoning against a scoring rubric. Topic-specific FRQ practice is available at /ap-world/unit-7.
The best place to find AP World Unit 7 practice questions, including multiple-choice and practice test sets, is /ap-world/unit-7. You'll find MCQs and FRQs aligned to every topic in the unit, from shifting power after 1900 and the causes of World War I through mass atrocities and causation in global conflict. Working through topic-by-topic MCQ sets is one of the most efficient ways to prepare for the progress check and the full exam.
Start with the causes of World War I (Topic 7.2) and the shifting power dynamics of Topic 7.1, since those set up everything else in the unit. Then work chronologically through the interwar period, the causes of World War II, and mass atrocities, paying attention to how each event connects to the next. Here's a concrete study plan:
- Build a timeline linking Topics 7.1 through 7.9 so you can see causation across the whole unit.
- For each war, compare causes vs. conduct, since both show up in FRQs.
- Practice one SAQ or LEQ prompt per study session using evidence from the topics you just reviewed.
- Use MCQ sets to check your understanding of key turning points before the progress check. All topic guides and practice questions for this unit are at /ap-world/unit-7.