Both were created to promote international cooperation and prevent future wars. The League of Nations failed, while the UN has been more successful, though still faces challenges.

Both were fascist dictators who rose to power by exploiting economic hardship and nationalistic fervor. Both used propaganda, military force, and suppression of dissent to maintain control.

WWI: Imperialism, nationalism, alliance system. WWII: Unresolved issues of WWI, rise of fascism, aggressive expansionism.

The Triple Entente was an alliance of France, Britain, and Russia. The Triple Alliance was an alliance of Germany, Austria-Hungary, and Italy. These alliances created a complex web of obligations that contributed to the outbreak of WWI.

Both are totalitarian ideologies. Fascism emphasizes nationalism and a hierarchical society, while Communism emphasizes class struggle and a stateless society (in theory).

Both wars caused immense destruction and loss of life. WWII led to more significant geopolitical changes, including the division of Europe and the rise of the United States and the Soviet Union as superpowers.

The Treaty of Versailles was imposed on Germany by the Allies, while the Treaty of Brest-Litovsk was imposed on Russia by Germany. Both treaties resulted in significant territorial losses for the defeated powers.

Churchill was known for his inspiring speeches and unwavering determination, while Roosevelt was known for his pragmatic approach and ability to build consensus. Both leaders were crucial in the Allied victory.

In Germany, the Great Depression led to hyperinflation, unemployment, and the rise of extremist ideologies. In the United States, it led to widespread poverty, unemployment, and the New Deal policies.

In WWI, the US entered late but provided crucial resources and manpower. In WWII, the US played a more central role from the beginning, providing both military and economic support to the Allies.

A system designed to maintain peace in Europe that crumbled in the 19th century.

Competition for colonies that fueled tensions and created new rivalries.

A powerful force that both unified and divided, leading to the breakup of empires and desires for self-determination.

An alliance between France, Britain, and Russia before and during WWI.

An alliance between Germany, Austria-Hungary, and Italy before and during WWI.

A political system where dictators rise to power by exploiting economic hardship and nationalistic fervor.

A political ideology that emphasizes aggressive expansionist policies and strong central control.

The systematic genocide of Jews and other minorities by the Nazi regime during WWII.

An international organization created after WWI to prevent future wars, but ultimately failed.

An international organization created after WWII to promote international cooperation and prevent future wars.

Causes: End of WWI, desire to punish Germany. Effects: Resentment in Germany, economic instability, rise of extremist ideologies, set the stage for WWII.

Causes: Economic hardship, nationalistic fervor, weak democratic institutions. Effects: Aggressive expansionist policies, suppression of dissent, WWII.

Causes: Nazi ideology of racial superiority, anti-Semitism, scapegoating of Jews. Effects: Systematic genocide of Jews and other minorities, millions of deaths, lasting trauma and legacy of intolerance.

Causes: Technological advancements, new energy sources, increased trade. Effects: Arms race, increased military might, heightened tensions among nations.

Causes: Desire for resources, markets, and power. Effects: Increased competition and rivalry among European powers, exploitation of colonies, heightened tensions.

Causes: Shared culture, language, and history. Effects: Unification of nations, breakup of empires, desires for self-determination, conflict and rivalry.

Causes: Unrestricted submarine warfare, Zimmerman Telegram. Effects: Fresh troops and resources for the Allies, turning point in the war, eventual Allied victory.

Causes: Unresolved issues of WWI, rise of fascism, aggressive expansionism. Effects: Formation of the UN, economic hardship in Europe, demographic shifts, improved standard of living.

Causes: WWI losses, economic hardship, social inequality. Effects: Russia's withdrawal from WWI, rise of communism, creation of the Soviet Union.

Causes: Stock market crash, overproduction, banking failures. Effects: Economic hardship, unemployment, rise of extremist ideologies, political instability.