Terrorism Prevention 81 Government policy 48 Foreign relations 29 September 11 Terrorist Attacks, 2001 29 War on terrorism, 2001- 25 National security 23 United States 23 History 13 Intelligence service 9 Politics and government 9 Qaida (Organization) 9 Civil defense 8 Religious aspects 8 Military policy 7 Emergency management 6 Islam 6 Law and legislation 6 War on Terrorism, 2001- 6 Islamic fundamentalism 5 Jihad 5 Juvenile literature 5 Civil rights 4 Political aspects 4 Psychological aspects 4 Special operations (Military science) 4 Counterinsurgency 3 Defenses 3 Internal security 3 Law enforcement 3