Foreign relations History 21 World War, 1939-1945 20 Politics and government 10 Foreign economic relations 7 Causes 5 Diplomatic history 5 Economic conditions 5 Japanese 5 Campaigns 4 Colonies 3 Military policy 3 Pearl Harbor (Hawaii), Attack on, 1941 3 World War, 1914-1918 3 Addresses, essays, lectures 2 Congresses 2 Emigration and immigration 2 Emigration and immigration law 2 Foreign public opinion, American 2 Imperialism 2 International relations 2 Japan 2 Legal status, laws, etc 2 National security 2 Peace 2 Sino-Japanese War, 1937-1945 2 Strategic aspects 2 Aliens 1 Atomic bomb 1 Balance of power 1