http://en.wikipedia.org/wiki/Gulf_of_Tonkin_Resolution Gulf of Tonkin Resolution
The Gulf of Tonkin Resolution was a joint resolution of the U.S. Congress passed in August 1964 in direct response to a minor naval engagement known as the Gulf of Tonkin Incident. It is of historical significance because it gave U.S. President Lyndon B. Johnson authorization, without a formal declaration of war by Congress, for the use of military force in Southeast Asia. The Johnson administration subsequently cited the resolution as legal authority for its rapid escalation of U.S. military involvement in the Vietnam conflict.<1>
The Gulf of Tonkin Incident began with an attack by three North Vietnamese torpedo boats on the Maddox, a U.S. destroyer, in the Gulf of Tonkin on 2 August 1964. Two days later, that vessel and another U.S. destroyer in the area both reported themselves under renewed attack, although North Vietnam subsequently insisted that it hadn't attacked — and no attack is now believed to have occurred on the 4th of August.
Within hours, Johnson ordered retaliatory air strikes on the bases of the North Vietnamese boats and announced, in a television address to the American public the same evening, that U.S. naval forces had been attacked. In a message he sent to Congress the following day, the President affirmed that "the North Vietnamese regime had conducted further deliberate attacks against U.S. naval vessels operating in international waters."
Johnson requested approval of a resolution "expressing the unity and determination of the United States in supporting freedom and in protecting peace in southeast Asia". He said that the resolution should express support "for all necessary action to protect our Armed Forces" — but repeated previous assurances that "the United States... seeks no wider war". As the nation entered the final three months of political campaigning for the 1964 elections (in which Johnson was standing for election), the president contended that the resolution would help "hostile nations... understand" that the United States was unified in its determination "to continue to protect its national interests."<2>
After fewer than nine hours of committee consideration and floor debate, Congress voted, on August 7, 1964, on a joint resolution which authorized the president "to take all necessary steps, including the use of armed force, to assist any member or protocol state of the Southeast Asia Collective Defense Treaty requesting assistance in defense of its freedom."<5> The unanimous affirmative vote in the House of Representatives was 416-0. (However, Congressman Eugene Siler of Kentucky, who was not present but opposed the measure, was "paired" with another member who favored the resolution — i.e., his opposition was not counted, but the vote in favor was one less than it would have been.) The Senate conferred its approval by a vote of 88-2. Some members expressed misgivings about the measure, but in the end, Senators Wayne Morse of Oregon and Ernest Gruening of Alaska cast the only nay votes.<6> "I believe this resolution to be a historic mistake," warned Senator Morse.<7>