The United States feared that a communist victory in Vietnam would lead to the spread of communism throughout Southeast Asia, which would threaten American interests in the region.

The Soviet Union provided the most military and economic aid to North Vietnam during the war, including weapons, ammunition, and training for North Vietnamese troops.

Operation Rolling Thunder was the name of the American military strategy that involved the use of massive bombing campaigns against North Vietnam from 1965 to 1968.

The Paris Peace Accords were signed in 1973 to end the Vietnam War. The agreement called for a ceasefire, the withdrawal of American troops from Vietnam, and the release of American prisoners of war.

Over 58,000 American soldiers died in the Vietnam War.

Over 2 million Vietnamese soldiers died in the Vietnam War.

Over 2 million civilians died in the Vietnam War.

Richard Nixon was the American president who authorized the invasion of Cambodia in 1970.

Richard Nixon was the American president who signed the Paris Peace Accords in 1973.

Creighton Abrams was the American general who oversaw the American military effort in Vietnam from 1968 to 1972.

Vo Nguyen Giap was the North Vietnamese general who led the Tet Offensive in 1968.

Larry Burrows was the American journalist who was killed in Vietnam in 1965.

Nick Ut was the American photographer who took the iconic photograph of a young girl running naked after a napalm attack in 1972.

The Deer Hunter was the American film that was released in 1978 and depicted the experiences of American soldiers during the Vietnam War.

The Killing Fields was the American film that was released in 1979 and depicted the experiences of Vietnamese civilians during the Vietnam War.