An incident at the gulf of tonkin, off the eastern coast of became the justification for increasing the level of u. s. involvement in the war in vietnam during the johnson administration.

An incident at the Gulf of Tonkin, off the eastern coast of Vietnam, became the justification for increasing the level of U.S. involvement in the warin Vietnam during the Johnson administration. The United sates of America wanted the rebels to sign a peace agreement and end the war. I hope the answer has come to your help.