History History -- 19 Terrorism -- 19 Political science -- 10 Terrorism 7 International relations -- 5 Economic aspects 4 more ... Foreign relations -- 4 History. -- 4 Nationalism -- 4 Peacekeeping forces -- 4 Philosophy 4 Politics and government 4 Prevention 4 Civil rights -- 3 Communism -- 3 Democracy -- 3 Feminism -- 3 Foreign relations 3 International relations 3 Islam 3 Nationalism 3 World politics 3 Administration -- 2 Armed Forces -- 2 Capitalism -- 2 Civilization 2 Colonies -- 2 Competition, International -- 2 Diplomacy -- 2 less ...