Prevention -- Terrorism -- 4 Foreign relations -- 2 Government policy -- 2 Case studies 1 Civil defense -- 1 Defenses 1 more ... Economic sanctions, American 1 Emergency management -- 1 Government policy 1 National security -- 1 Politics and government 1 Politics and government -- 1 Relations 1 September 11 Terrorist Attacks, 2001 1 Terrorists -- 1 War on terrorism, 2001- 1 less ...