What made Standard Oil How did the Gulf of Tonkin Resolution lead to the escalation of US troop involvement in the Vietnam War?
It gave the president the ability to send troops without specific approval of Congress.
It declared war on North Vietnam, making commitment of US troops necessary.
It barred South Vietnamese troops from the conflict, making it necessary for US troops to fight.
It specifically committed the first US troops to fight and serve in the Vietnam War.a horizontal integration monopoly?