How did the vietnam war contribute to passage of the war powers act?

It demonstrated to the Congress that the president's control over the use of troops must be limited.

During the Korean and Vietnam wars, the United States got involved in the conflicts without a formal declaration of war. This was seen as a problem by Congress, which believed that its authority was being undermined. Congress is meant to have the authority to decide when the United States uses its armed forces. Moreover, during the Vietnam War, President Nixon authorized bombings in Cambodia without notifying Congress. These events prompted the passage of the War Powers Act.

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