History Foreign relations -- 6 History -- 2 Alliances -- 1 Arms control -- 1 Decision making -- 1 Diplomatic history 1 more ... Emigration and immigration -- 1 Energy policy -- 1 Environmental aspects 1 Foreign economic relations 1 Foreign trade regulation -- 1 Great powers 1 Hegemony -- 1 Immigrants -- 1 International Trade Commission -- 1 International economic relations -- 1 National security -- 1 Petroleum industry and trade -- 1 Political aspects 1 Political aspects -- 1 Politics and government -- 1 Ratification -- 1 Relations -- 1 Treaties 1 Treaties -- 1 World War, 1939-1945 -- 1 less ...