Terrorism -- Prevention 9 Prevention -- 7 Terrorism 5 Terrorists -- 4 History -- 3 International cooperation 3 more ... Psychological aspects 3 Psychology 3 Case studies 2 Foreign relations -- 2 Government policy -- 2 Biological warfare -- 1 Chemical warfare -- 1 Child terrorists 1 Congresses -- 1 Deterrence(strategy) 1 Economic aspec 1 Economic aspects 1 Economic sanctions, American 1 Effect of terrorism on 1 Forecasting 1 Globalization 1 International cooperation -- 1 International relations 1 International security 1 International trade -- 1 Islam 1 Islamic fundamentalism 1 Islamic fundamentalism -- 1 less ...