World Wars: Refers to two major global conflicts - World War I (1914-1918) and World War II (1939-1945) - that had far-reaching consequences on international relations, politics, and society.
Cold War: Describes the state of geopolitical tension between the United States and Soviet Union from roughly 1947 to 1991. It was characterized by ideological competition, proxy wars, arms race, and nuclear brinkmanship.
Civil Rights Movement: A social movement primarily in the United States during the mid-20th century that aimed to end racial segregation and discrimination against African Americans through nonviolent protests, legal battles, and grassroots activism.