Foreign relations -- Terrorism -- 16 Government policy -- 9 War on Terrorism, 2001-2009 8 History -- 7 Politics and government -- 5 National security -- 3 more ... September 11 Terrorist Attacks, 2001 3 Causes 2 Globalization 2 Imperialism 2 Intelligence service -- 2 Iran Hostage Crisis, 1979-1981 2 Islam 2 Islam and politics -- 2 Islamic fundamentalism 2 Law and legislation 2 Military policy 2 Prevention -- 2 Prevention. -- 2 September 11 Terrorist Attacks, 2001 -- 2 War -- 2 War and emergency powers -- 2 Arab-Israeli conflict 1 Armed Forces -- 1 Christianity and other religions -- 1 Civil rights -- 1 Civil-military relations -- 1 Civilization, Modern -- 1 Cold War 1 less ...