The Berlin Airlift (1948-1949) was a major event in the early Cold War, when the Soviet Union blockaded West Berlin in an attempt to force the Western Allies to withdraw from the city.

The Truman Doctrine (1947) was a policy adopted by the United States to provide economic and military aid to countries threatened by communist expansion.

The Korean War (1950-1953) began when North Korea invaded South Korea in an attempt to unify the country under communist rule.

NATO (North Atlantic Treaty Organization) was formed in 1949 as a military alliance between the United States, Canada, and several Western European countries.

The Gulf of Tonkin Incident (1964) was a series of alleged attacks by North Vietnamese forces on U.S. naval vessels in the Gulf of Tonkin, which led to the escalation of the Vietnam War.

Vietnamization (1969-1973) was a policy adopted by the United States to gradually withdraw its troops from Vietnam and transfer the responsibility for the war to the South Vietnamese government.

The Fall of Saigon (1975) marked the end of the Vietnam War, when North Vietnamese forces captured Saigon, the capital of South Vietnam.

The Paris Peace Accords (1973) was a peace agreement that was signed to end the Vietnam War.

Richard Nixon was the U.S. president who oversaw the withdrawal of U.S. troops from Vietnam.

Ho Chi Minh was the communist leader of North Vietnam during the Vietnam War.

China provided the most military aid to North Vietnam during the Vietnam War.

Operation Ranch Hand was the name of the U.S. military operation that involved the use of defoliants and herbicides to destroy crops and vegetation in Vietnam.

Richard Nixon authorized the invasion of Cambodia in 1970.

Operation Linebacker was the name of the U.S. military operation that involved the bombing of North Vietnam in 1972.

Richard Nixon signed the War Powers Act in 1973.