Terrorism -- Foreign relations -- 5 War on Terrorism, 2001-2009 4 Government policy -- 3 Politics and government -- 3 Prevention -- 3 War on terrorism, 2001- 3 more ... National security -- 2 Terrorists -- 2 Civil defense 1 Civil defense -- 1 Civil rights -- 1 Combatants and noncombatants (International Law) 1 Defenses 1 Detention of persons -- 1 Executive power -- 1 Harbors -- 1 International cooperation 1 Legal status, laws, etc -- 1 Merchant marine -- 1 National security 1 Prevention 1 Prevention. -- 1 Security measures 1 Security measures -- 1 September 11 Terrorist Attacks, 2001 1 War (International law) 1 War and emergency powers -- 1 World politics -- 1 less ...