Began when communist guerilla fighters, the Viet Cong, attacked villages in South Vietnam to pressure the nation to accept communism and Ho Chi Minh's rule
US began sending military advisors and supplies to South Vietnam, and later invaded Cambodia to remove North Vietnamese forces
South Vietnam plunged into political turmoil, and the US launched bombing campaigns against North Vietnam
After years of fighting, a ceasefire was signed in 1973 but was violated by North Vietnam in 1975, leading to the fall of Saigon
The Gulf of Tonkin Resolution provided the United States with legal justification to take military action in Vietnam, but some claimed the attack in the Gulf of Tonkin was fabricated
Political leaders in Washington, DC denied Westmoreland's wishes for an all-out invasion of North Vietnam because they believed it would bring "an unacceptable risk of confrontation with the USSR"
During his administration, US President Richard Nixon began to withdraw American troops and replace them with South Vietnamese soldiers in a policy known as "Vietnamization"
The US Department of State had decided to decrease American involvement in Vietnam because of the fear that it might further hinder the effort to open relations with China