When Japan surrendered to the Allies in 1945, they gave up Vietnam.
French troops returned to Vietnam to gain control back and they drove the Vietminh into hiding.
When the fighting escalated, France appealed to the U.S. for help.
Even though the United States opposed colonialism, they feared communism more.
Eisenhower decided to aid the french and defended his decision with the domino theory, which is the idea that if Vietnam fell to communism, the rest of Southeast Asia would follow.
On August 2, 1964, Johnson announced that North Vietnamese torpedo boats had fired on two U.S. destroyers in the Gulf of Tonkin. Two days later, another attack was reported.
President Johnson asked Congress for the authority to defend American forces and allies in Southeast Asia.
Congress agreed and passed the Gulf of Tonkin Resolution that authorized the president to take all necessary measures to repel any armed attack against the United States forces and to prevent further aggression.
Opposition towards the war began to grow as the months passed.
Despite all of the valid points the people opposed to the war made, Johnson was determined to continue fighting. He recognized this as a resistance to communism.
He was not alone in his views, and the nation divided into to different camps.
The Doves wanted the United States to leave Vietnam, and the Hawks wanted the nation to stay and fight.