Defenses Politics and government -- Civil defense 1 Civil defense -- 1 Economic conditions - 1989- 1 Foreign relations -- 1 Harbors -- 1 more ... History 1 Merchant marine -- 1 National security 1 National security -- 1 Prevention 1 Security measures 1 Security measures -- 1 Terrorism -- 1 War on Terrorism, 2001-2009 1 less ...