International relations (1919–1939) covers the main interactions shaping world history in this era, with emphasis on diplomacy and economic relations. The coverage here follows Diplomatic history of World War I and precedes Diplomatic history of World War II. The important stages of interwar diplomacy and international relations included resolutions of wartime issues, such as reparations owed by Germany and boundaries; American involvement in European finances and disarmament projects; the expectations and failures of the League of Nations; the relationships of the new countries to the old; the distrustful relations of the Soviet Union to the capitalist world; peace and disarmament efforts; responses to the Great Depression starting in 1929; the collapse of world trade; the collapse of dem