Terrorism Prevention 225 Government policy 68 History 63 Religious aspects 63 Islam 54 Terrorists 53 National security 37 War on terrorism, 2001- 30 United States 27 Thesis 26 Psychological aspects 24 World politics 24 Political violence 23 Congresses 22 Foreign relations 22 International cooperation 20 Jihad 20 September 11 Terrorist Attacks, 2001 20 Islamic fundamentalism 19 Dissertations, Academic 18 Psychology 17 Politics and government 16 Qaida (Organization) 16 Case studies 15 Forecasting 11 Law and legislation 11 Violence 11 Weapons of mass destruction 11 Counterinsurgency 10