Prevention Terrorism -- 3 War on Terrorism, 2001-2009 2 Civil defense 1 Civil defense -- 1 Defenses 1 Foreign relations 1 more ... Foreign relations -- 1 Globalization 1 Harbors -- 1 Merchant marine -- 1 National security 1 National security -- 1 Politics and government -- 1 Security measures 1 Security measures -- 1 September 11 Terrorist Attacks, 2001 1 Terrorism 1 less ...