In 1964 Congress passed the which allowed President Johnson to send troops to Vietnam?

In 1964, Congress passed the Gulf of Tonkin Resolution, which granted President Lyndon B. Johnson the authority to use military force in Vietnam without a formal declaration of war. This resolution was prompted by incidents in the Gulf of Tonkin involving U.S. naval vessels and North Vietnamese forces. It effectively escalated U.S. involvement in the Vietnam War, leading to a significant increase in American troop deployment.