After just nine hours of deliberation, both houses of Congress passed the Gulf of Tonkin resolution today in 1964. The bill authorizing the United States to officially go to war with Vietnam was signed by President Lyndon Johnson three days later. Of course, the United States had been increasingly involved in Vietnam at least since 1955, when then-President Eisenhower deployed the Military Assistance Advisory group to help train the South Vietnamese Army.
The supposed August 4th attack on the USS Maddox was used to legitimize the growing U.S. presence in Vietnam and to give the President authority to use the military in the effort to combat Communist North Vietnam. Even Johnson questioned the legitimacy of the Gulf of Tonkin. A year after the incident, Johnson said to then Press Secretary Bill Moyers, "For all I know, our Navy was shooting at whales out there."