Unit 7: Global Conflict (1900-Present)

📚Study Guide: Global Conflict (1900-Present)

Unit 7: Global Conflict (c. 1900–c. 1945)

This unit examines the causes, conduct, and catastrophic consequences of the two world wars and the revolutionary upheavals that reshaped the global order in the first half of the twentieth century. World War I emerged from a volatile combination of militarism, entangling alliances, imperialist competition, and rising nationalism, ignited by the assassination of Archduke Franz Ferdinand in 1914. The war devolved into a brutal stalemate of trench warfare and total mobilization, exhausting the European powers and destroying millions of lives. The Russian Revolution of 1917, driven by war weariness, economic collapse, and revolutionary ideology, overthrew the Tsarist regime and brought the Bolsheviks to power under Vladimir Lenin. The Bolsheviks withdrew Russia from the war through the Treaty of Brest-Litovsk and attempted to construct a socialist state, inspiring and terrifying elites worldwide. The postwar settlement at Versailles redrew the map of Europe, imposed harsh reparations and the war guilt clause on Germany, created the League of Nations, and established the mandate system in the Middle East and Africa—planting seeds of future conflict. The interwar period witnessed the Great Depression, the collapse of democratic regimes, and the rise of fascism in Italy and Nazism in Germany. Adolf Hitler's expansionist aggression, combined with Japanese imperialism in Asia, precipitated World War II. This second global conflict introduced blitzkrieg, strategic bombing, the Holocaust, and ultimately the atomic bomb, which killed hundreds of thousands in Hiroshima and Nagasaki and ushered in the nuclear age. By 1945, Europe's global dominance had been shattered, the colonial empires were weakened, and two new superpowers—the United States and the Soviet Union—stood poised to divide the world.

Key Concepts

• Causes of World War I: Militarism (arms races, conscription), alliance systems (Triple Alliance vs. Triple Entente), imperialism (competition for colonies), and nationalism (ethnic tensions, Balkan crises) created an environment in which the assassination of Franz Ferdinand triggered a continent-wide war.
• Total War and Trench Warfare: WWI mobilized entire societies (home fronts, propaganda, rationing) and produced unprecedented casualties through machine guns, artillery, gas warfare, and the stalemate of trench networks on the Western Front.
• Russian Revolution: The 1905 Revolution, the February Revolution (1917) that overthrew the Tsar, and the October Revolution (1917) in which the Bolsheviks seized power; Lenin's leadership, War Communism, the New Economic Policy (NEP), and the Russian Civil War.
• Treaty of Versailles and Mandate System: The peace conference imposed reparations, territorial losses, and the war guilt clause on Germany; created the League of Nations; and transferred German and Ottoman territories to Allied powers as mandates, ignoring Arab nationalist aspirations.
• Interwar Instability: The Great Depression triggered mass unemployment and political extremism; the Weimar Republic collapsed; fascism under Mussolini and Nazism under Hitler promised national revival through authoritarianism, militarism, and racial ideology.
• World War II: German blitzkrieg across Europe, Japanese expansion in Asia and the Pacific, the Holocaust (systematic genocide of six million Jews and millions of others), Allied victory, and the atomic bombings that ended the war against Japan.
• Consequences: Decolonization accelerated; Europe's global hegemony ended; the United Nations replaced the League; and the U.S. and USSR emerged as rival superpowers.

Vocabulary

• Militarism: The glorification of military strength and the aggressive preparation for war as a national policy.
• Trench Warfare: A form of combat in which opposing armies fight from fortified ditches, producing grueling stalemate and massive casualties.
• War Guilt Clause: Article 231 of the Treaty of Versailles assigning sole responsibility for WWI to Germany and its allies.
• Reparations: Payments demanded from defeated nations after a war; the massive reparations imposed on Germany contributed to economic instability and resentment.
• Bolshevik: A member of the Russian Communist Party led by Lenin that seized power in the October Revolution of 1917.
• Proletariat: The working class; central to Marxist theory and Bolshevik ideology.
• Fascism: An authoritarian, nationalist ideology emphasizing the supremacy of the state, militarism, and often racial hierarchy; exemplified by Mussolini's Italy and Hitler's Germany.
• Appeasement: The policy of making concessions to an aggressor state in order to avoid war, most famously Britain and France's accommodation of Hitler before 1939.
• Genocide: The systematic destruction of a racial, ethnic, or religious group; the Holocaust was the Nazi genocide of six million Jews and millions of Roma, disabled people, political dissidents, and LGBTQ+ individuals.
• Blitzkrieg: "Lightning war"; German military tactic using rapid, combined arms assaults to overwhelm enemies quickly.

Historical Cause-Effect Relationships

• Cause: The alliance system, militarism, and imperialist competition created a hair-trigger environment in Europe. Effect: The assassination of Franz Ferdinand in 1914 triggered a chain reaction of mobilizations and declarations of war that engulfed the continent.
• Cause: WWI devastation, economic collapse, and food shortages discredited the Tsarist regime and empowered radical parties. Effect: The Bolshevik Revolution of 1917, the world's first communist state, and the subsequent Russian Civil War.
• Cause: The Treaty of Versailles blamed Germany for WWI, imposed massive reparations, and redrew borders without regard to ethnic self-determination. Effect: German economic crisis, political instability, and the rise of Nazism, which exploited resentment to seize power.
• Cause: WWII destroyed European power, discredited colonial rule, and demonstrated the military and economic dominance of the United States and Soviet Union. Effect: Accelerated decolonization after 1945, the division of Europe, and the onset of the Cold War.

Common Mistakes

• Attributing blame for WWI solely to Germany; all major powers shared responsibility through their alliance commitments, arms races, and imperialist competition.
• Conflating the February and October Revolutions; the February Revolution overthrew the Tsar and established a provisional government, while the October Revolution brought the Bolsheviks to power.
• Ignoring Japanese aggression before 1939 by focusing exclusively on Hitler's European expansion; Japan's invasion of Manchuria (1931) and China (1937) were critical to the origins of WWII.
• Minimizing the Holocaust by treating it as one of many WWII atrocities; the Holocaust was a systematically planned, state-sponsored genocide unprecedented in scale and intent.

AP Exam Strategies

• DBQ Tip: For WWI/WWII documents, identify whether the author is a diplomat, soldier, civilian, or propagandist; perspectives on war aims and peace terms vary dramatically by position and nationality.
• LEQ Formula: "The outbreak of World War I/II resulted from [long-term structural causes] and [immediate triggers], producing [political/economic/social transformation] that [ended empires/created new ideologies]."
• SAQ Strategy: Name specific treaties (Versailles, Brest-Litovsk), battles (Somme, Stalingrad), and policies (War Communism, NEP) to demonstrate precise historical knowledge.
• Comparison: Compare fascism and communism as totalitarian ideologies, noting similarities in state control and propaganda while distinguishing their social bases and economic structures.

Comparisons and Continuities/Changes

• Comparison: World War I was fought primarily for imperial and territorial objectives with limited ideological stakes, whereas World War II involved existential ideological conflicts between fascism, communism, and liberal democracy, resulting in more decisive postwar transformations.
• Comparison: The Russian Revolution and the Chinese Revolution (later) both overthrew traditional regimes and established communist states, yet the Bolsheviks seized power in an urban, industrial context while the Chinese revolution was primarily rural and peasant-based.
• Continuity and Change: While the world wars destroyed European empires and discredited old aristocratic orders, nationalism remained a powerful force, fueling both anti-colonial liberation movements and new forms of ethnic conflict in the postwar era.