Answer:U.S. Involvement in the Vietnam War: the Gulf of Tonkin and Escalation, 1964. ... On August 7, 1964, Congress passed the Gulf of Tonkin Resolution, authorizing President Johnson to take any measures he believed were necessary to retaliate and to promote the maintenance of international peace and security in southeast Asia.
Step-by-step explanation:
The Gulf of Tonkin Resolution or the Southeast Asia Resolution, Pub.L. 88–408, 78 Stat. 384, enacted August 10, 1964, was a joint resolution that the United States Congress passed on August 7, 1964, in response to the Gulf of Tonkin incident