Terrorism -- 12 Politics and government -- 6 Prevention. -- 6 Foreign relations -- 5 Government policy -- 4 National security -- 4 War on Terrorism, 2001-2009 4 more ... Prevention 3 Prevention -- 3 Foreign relations 2 Politics and government 2 Security measures 2 Air power -- 1 Case studies 1 Civil defense 1 Civil defense -- 1 Civil rights -- 1 Combatants and noncombatants (International Law) 1 Defenses 1 Detention of persons -- 1 Economic sanctions, American 1 Executive power -- 1 Globalization 1 Harbors -- 1 History -- 1 Information warfare -- 1 Intelligence service -- 1 Islamic fundamentalism 1 Legal status, laws, etc -- 1 Merchant marine -- 1 less ...