20th century History -- African Americans -- 1 Armed Forces -- 1 Arms race -- 1 Ballistic missile defenses -- 1 Biography 1 more ... Biography -- 1 Civil rights -- 1 Civil rights workers -- 1 Emigration and immigration -- 1 Guerrilla warfare -- 1 Insurgency -- 1 Military history, Modern -- 1 Military policy 1 Politics and government -- 1 Procurement -- 1 Terrorism -- 1 less ...