Terrorism -- Foreign relations -- 15 Government policy -- 11 Prevention -- 10 History -- 6 Politics and government -- 5 September 11 Terrorist Attacks, 2001 5 more ... War on terrorism, 2001- 5 Military policy 4 National security -- 3 Political aspects 3 Case studies 2 Defenses 2 Foreign relations 2 Press coverage -- 2 Prevention 2 Asymmetric warfare -- 1 Case studies -- 1 Civil defense -- 1 Cold War 1 Counterinsurgency -- 1 Cross- cultural studies 1 Democracy -- 1 Drug traffic -- 1 Economic sanctions, American 1 Emergency management -- 1 Globalization -- 1 Government policy 1 Guerrillas -- 1 Influence 1 less ...