The 20th century was marked by significant global events, including two World Wars. World War I (1914-1918) involved many countries and led to major political changes, while World War II (1939-1945) was even more widespread, resulting in the formation of the United Nations to promote peace and cooperation. The century also saw the rise of the Cold War, a period of tension between the United States and the Soviet Union. This era included the Space Race, culminating in the Moon Landing in 1969, and significant social movements, such as the Civil Rights Movement in the 1960s, advocating for equality and justice.