Russia was a member of the Allied Powers, not the Central Powers.

The assassination of Archduke Franz Ferdinand is considered the immediate cause of World War I.

Germany lost significant territory, including Alsace-Lorraine, Eupen-Malmédy, and West Prussia, as a result of the Treaty of Versailles.

The League of Nations was created with the aim of preventing future wars and promoting international cooperation.

Great Britain, under Prime Minister Neville Chamberlain, pursued a policy of appeasement towards Nazi Germany in an attempt to avoid war.

Blitzkrieg, meaning 'lightning war,' was the German military strategy that emphasized speed, surprise, and concentrated force.

Japan was the first country to experience a nuclear attack when the United States dropped atomic bombs on Hiroshima and Nagasaki in August 1945.

D-Day, also known as Operation Overlord, was the Allied invasion of Normandy, France, on June 6, 1944.

The Yalta Conference was held in February 1945 between the leaders of the United States, Great Britain, and the Soviet Union to discuss the postwar world order.

The United Nations was established in 1945 to replace the League of Nations and promote international cooperation and peace.

The Soviet Union gained significant territory in Eastern Europe and Asia as a result of World War II.

Containment was the Cold War policy of the United States and its allies to prevent the spread of communism.

Mao Zedong led the Chinese Communist Party to victory in the Chinese Civil War in 1949, establishing the People's Republic of China.

NATO, the North Atlantic Treaty Organization, was formed in 1949 as a military alliance between the United States, Canada, and several European countries.

Fidel Castro led the Cuban Revolution in 1959, overthrowing the government of Fulgencio Batista and establishing a communist state.