Civil rights -- National security -- 3 Prevention -- 3 Terrorism -- 3 History -- 2 War on terrorism, 2001- 2 1st-10th -- 1 more ... 20th century 1 African Americans -- 1 Amendments -- 1 Biography 1 Biography -- 1 Cases -- 1 Civil defense -- 1 Civil rights workers -- 1 Constitutional law -- 1 Government policy -- 1 History 1 History. -- 1 Human rights -- 1 Law enforcement -- 1 Politics and government -- 1 September in terrorist attacks,2001 1 United States -- 1 politics and government -- 1 less ...