Terrorism Prevention 254 Religious aspects 86 History 84 Government policy 82 Islam 76 Terrorists 61 September 11 Terrorist Attacks, 2001 49 War on terrorism, 2001- 45 National security 42 United States 40 Foreign relations 36 Jihad 31 Psychological aspects 29 Politics and government 28 World politics 28 Islamic fundamentalism 27 Political violence 27 Thesis 27 Congresses 23 Qaida (Organization) 23 International cooperation 20 Dissertations, Academic 19 Psychology 17 Biography 16 Case studies 15 Islam and politics 14 Juvenile literature 14 Weapons of mass destruction 14 Violence 13