Make it a full answer cuz well that only makes what action by congress allowed president johnson to expand the war in vietnam? why? what were the results?

The reported aggression in the Gulf of Tonkin off the coast of Vietnam led an outraged Congress to authorize Johnson to ramp up efforts to defeat the North Vietnamese; later, an investigation into the incident raised doubts as to whether President Johnson's version of the event in the Gulf of Tonkin (which led to Congress's approval of the resolution) was accurate

I'll go with that