Answer:
By giving the president larger powers to use force and other means necessary to face the communist moves in Southeast Asia.
Explanation:
The so-called Gulf of Tonkin Resolution was passed by Congress on August 7, 1964. It authorized president Lyndon B. Johnson "to take all necessary measures to repel any armed attack against the forces of the United States and to prevent further aggression” by the communists of North Vietnam.
It followed the alledged attack on two U.S. Navy destroyers by North Vietnamese boats in international waters of the Gulf of Tonkin. This resolution opened the door to full military engagement by the US in the conflict in Vietnam.
Becuase the south thought that it was unconstitutional
I would say the answer would be the 2nd one bc his administration cast a “new look” at US national strategy, which resulted in emphasis on nuclear war fighting.