Terrorism Prevention 259 Religious aspects 90 Government policy 86 History 86 Islam 80 Terrorists 64 September 11 Terrorist Attacks, 2001 48 War on terrorism, 2001- 47 United States 44 National security 43 Foreign relations 39 Jihad 31 Politics and government 30 Thesis 29 Psychological aspects 28 Political violence 27 Islamic fundamentalism 26 World politics 25 Congresses 24 Qaida (Organization) 23 Dissertations, Academic 21 International cooperation 20 Biography 19 Psychology 17 Case studies 15 Juvenile literature 15 Weapons of mass destruction 14 Islam and politics 13 Violence 13