Terrorism -- 13 Terrorism 8 History 6 History -- 5 Jihad 5 Prevention 5 Terrorism -- 5 more ... IS -- 4 Politics and government 4 Artificial intelligence 3 Islam 3 Islamic fundamentalism 3 Organization 3 Political violence 3 Religious aspects 3 September 11 Terrorist Attacks, 2001 3 War on Terrorism, 2001-2009 3 World politics -- 3 Artificial Intelligence 2 Artificial intelligence--Social aspects 2 Communism -- 2 Counterinsurgency -- 2 Ethnicity -- 2 Foreign relations 2 Foreign relations -- 2 Globalization 2 Government policy -- 2 History. -- 2 International relations 2 Islam -- 2 less ...