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Shifting Power After 1900 - AP Modern World History Study Guide

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Learn with study guides reviewed by top AP teachers. This guide takes about 15 minutes to read.

Getting Started

The dawn of the 20th century saw a world dominated by Western powers and their extensive maritime empires. However, this global political order was not static. Several of the world's oldest and largest land-based empires, including the Ottoman, Russian, and Qing, faced immense internal and external pressures that threatened their very existence. This period marks a critical turning point where old imperial structures began to crumble, giving way to new states and revolutionary ideologies.

What You Should Be Able to Do

  • Explain the internal and external factors that caused the collapse of the Ottoman, Russian, and Qing empires.

  • Analyze how the collapse of the Russian Empire led to a communist revolution.

  • Describe the causes of the Mexican Revolution as a challenge to the existing political order.

  • Compare the reasons for state collapse and change in different regions after 1900.

Key Developments & Analysis

This section analyzes the causes behind the dramatic shifts in state power in the early 20th century, focusing on the factors that led to the collapse of major land-based empires and the rise of revolutionary movements.

The Collapse of Land-Based Empires: A Causal Analysis

At the start of the 20th century, several large, diverse, and long-standing empires were straining under the pressures of the modern era. Their eventual collapse was not due to a single event but a combination of long-term internal weaknesses and potent external forces.

The Ottoman Empire

The Ottoman Empire, once a dominant power spanning three continents, entered the 20th century in a state of severe decline, often called the "Sick Man of Europe."

  • Internal Causes:

    • Political Instability: The central government had weakened over centuries, struggling to control its vast and diverse territories.

    • Economic Weakness: An over-reliance on agriculture, a failure to industrialize on par with Europe, and extensive foreign debt crippled the economy.

    • Social & Ethnic Tensions: The rise of nationalism among the empire's diverse ethnic groups (e.g., Arabs, Armenians, Slavs) led to widespread unrest and independence movements.

  • External Causes:

    • Military Defeats: A series of costly wars in the 19th and early 20th centuries resulted in significant territorial losses, particularly in the Balkans.

    • European Imperialism: European powers, especially Britain, France, and Russia, encroached on Ottoman territories and exerted immense economic and political pressure, further weakening the state.

The Russian Empire

The vast Russian Empire, ruled by an autocratic tsar, faced a combination of social rigidity and the strains of rapid, state-directed industrialization.

  • Internal Causes:

    • Political Repression: The autocratic rule of the tsar alienated nearly every segment of society, from peasants and factory workers to intellectuals and ethnic minorities.

    • Economic Distress: Widespread poverty, vast inequality between the nobility and the serf-descended peasantry, and brutal working conditions in new factories created a deeply discontented population.

    • Social Unrest: A growing wave of strikes, protests, and revolutionary movements challenged the tsar's authority long before the final collapse.

  • External Causes:

    • Defeat in War: A humiliating defeat in the Russo-Japanese War (1905) exposed the military and industrial weakness of the empire.

    • World War I: The immense strain of World War I was the final blow. Military casualties, food shortages, and economic collapse delegitimized the government and triggered widespread revolution.

  • Outcome: Communist Revolution

    The collapse of the tsarist regime in 1917 did not lead to a stable democracy. Instead, it created a power vacuum that was filled by the Bolsheviks, a radical socialist group. They led a second revolution that established the world's first communist state. Communism is a political and economic ideology that advocates for a classless society where all property and wealth are communally-owned, rather than by individuals.

The Qing Dynasty in China

The Qing Dynasty, China's final imperial dynasty, faced a crisis of legitimacy as it struggled to confront internal decay and aggressive foreign powers.

  • Internal Causes:

    • Ethnic Tensions: The ruling Qing were Manchu, an ethnic minority, which led to resentment from the majority Han Chinese population.

    • Perpetual Unrest: Peasant revolts, widespread famine, and government corruption demonstrated the dynasty's inability to govern effectively.

    • Weak Central Government: The central government failed to enact meaningful reforms and could not control powerful regional warlords.

  • External Causes:

    • Foreign Encroachment: Decades of economic imperialism by Western powers and Japan, beginning with the Opium Wars, had carved China into spheres of influence, undermining Qing sovereignty.

    • Military Humiliation: Repeated military defeats at the hands of foreign powers eroded the dynasty's prestige and authority.

Challenges to the Existing Order: The Mexican Revolution

Beyond the collapse of old empires, other states challenged the existing political and social structures. The Mexican Revolution (c. 1910-1920) was a complex and violent struggle that arose from deep-seated internal problems. It was a rejection of the established political order rather than a collapse of a traditional land-based empire.

  • Causes (Primarily Internal):

    • Political Crisis: The revolution was triggered by a crisis of succession. The long, authoritarian rule of President Porfirio Díaz had created a rigid political system that excluded most Mexicans from power and suppressed dissent.

    • Social Inequality: A tiny elite owned most of the land and wealth, while the vast majority of the population, particularly indigenous and peasant communities, lived in poverty.

    • Economic Disparity: Díaz's policies favored foreign investors and the domestic elite, leading to widespread discontent among workers and rural populations whose lands and livelihoods were threatened.

Data & Organization Tools

Comparing the Collapse of Land-Based Empires

EmpireKey Internal FactorsKey External FactorsPrimary Outcome
Ottoman EmpireEthnic nationalism, weak economy, political corruptionMilitary defeats, European economic and territorial pressureDissolution into smaller states (e.g., Turkey)
Russian EmpireSocial inequality, political autocracy, economic strainDefeat in wars (Russo-Japanese, WWI), industrial gap with WestOverthrow of the tsar; establishment of a communist state
Qing DynastyHan resentment of Manchu rule, famine, government corruptionForeign imperialism (spheres of influence), military defeatsOverthrow of the emperor; establishment of a republic

Evidence Bank

  • Ottoman Empire: A large, Turkish-led, multi-ethnic Islamic empire that controlled parts of Southeastern Europe, North Africa, and the Middle East. Its slow decline and eventual collapse after World War I reshaped the modern Middle East.

  • Russian Empire: A vast, autocratic state spanning Eastern Europe and Northern Asia. Its collapse in 1917 was a direct result of internal tensions exacerbated by the strain of World War I, leading to the Bolshevik Revolution.

  • Qing Dynasty: The last imperial dynasty of China, ruled by the Manchu people. It collapsed in 1911 due to a combination of internal rebellion, corruption, and the pressure of foreign imperialism.

  • Communism: A political theory derived from Karl Marx, advocating for a society in which all property is publicly owned and each person works and is paid according to their abilities and needs. It became the guiding ideology for the new state in Russia.

  • Mexican Revolution: A major armed struggle from roughly 1910 to 1920 that radically transformed Mexican politics and society. It began as a rejection of the authoritarian rule of Porfirio Díaz and addressed widespread social and land inequality.

  • Sun Yat-sen: A key figure in the overthrow of the Qing Dynasty and the "father" of the Republic of China. His ideology called for nationalism, democracy, and the people's livelihood.

  • Bolsheviks: A radical faction of the Russian socialist movement, led by Vladimir Lenin, that seized power in the October Revolution of 1917 and founded the Soviet Union.

  • World War I (1914-1918): A global conflict that acted as a critical external pressure, accelerating the collapse of the Russian, Ottoman, and Austro-Hungarian empires.

Skill Snapshots

  • Causation: The immense economic and human costs of World War I directly caused the collapse of public support for the Russian tsar, leading to revolution. Internal political crisis and massive social inequality caused the outbreak of the Mexican Revolution.

  • Comparison: While both the Qing and Ottoman empires collapsed due to a combination of internal decay and foreign pressure, the Russian Empire's collapse was unique in that it resulted in the establishment of the world's first communist state.

  • CCOT:

    • Baseline: Around 1900, the global political order was dominated by large, land-based (Ottoman, Russian, Qing) and maritime (British, French) empires.

    • Change: By 1920, the Ottoman, Russian, and Qing empires had all collapsed, replaced by new political entities like the Republic of Turkey and the Soviet Union.

    • Continuity: Despite the fall of these specific empires, the concept of a centralized state as the primary unit of political organization continued and was adopted by the new governments that replaced the old imperial regimes.

Common Misconceptions & Clarifications

  1. Misconception: These empires collapsed suddenly.

    • Clarification: The collapse was the final stage of a long decline. All three land-based empires had been weakening for decades due to internal and external pressures.
  2. Misconception: The fall of empires was caused only by European powers.

    • Clarification: External pressure from the West was a major factor, but internal problems like corruption, ethnic strife, and economic weakness were equally, if not more, important causes of collapse.
  3. Misconception: All revolutions in this era were communist.

    • Clarification: While Russia's revolution was explicitly communist, the Mexican Revolution was driven by demands for land reform, democracy, and social justice, not Marxist ideology.
  4. Misconception: When these empires fell, their people were immediately free and independent.

    • Clarification: The collapse often led to prolonged periods of civil war, political instability, and foreign intervention before new, stable states could be established.

One-Paragraph Summary

The early 20th century witnessed a fundamental shift in the global balance of power as long-standing, land-based empires gave way to new states. The Ottoman, Russian, and Qing empires all collapsed under the combined weight of internal factors—such as political corruption, economic stagnation, and social unrest—and external pressures, including military defeat and foreign imperialism. In Russia, this collapse uniquely paved the way for the world's first communist revolution. Simultaneously, other states like Mexico challenged the existing political and social order through revolutionary movements born from deep-seated domestic crises. These events dismantled centuries-old political structures and set the stage for the new conflicts and ideologies that would define the rest of the century.