Government policy -- Terrorism -- 20 Foreign relations -- 12 Prevention -- 10 Politics and government -- 7 History -- 6 Nuclear weapons -- 6 more ... National security -- 5 War on terrorism, 2001- 5 Case studies 4 Congresses -- 4 Economic policy 4 Government policy 4 Petroleum industry and trade -- 4 Politics and government 4 Refugees -- 4 Congresses 3 Economic conditions 3 Economic conditions -- 3 Foreign economic relations -- 3 Foreign relations 3 Human rights -- 3 Industrial policy -- 3 International cooperation 3 Produce trade -- 3 Arms transfers -- 2 Biography -- 2 Case studies -- 2 Computer networks -- 2 Computer security -- 2 less ...