Answer:
President Nixon's alleged abuse of authority in the Vietnam War led to the War Powers Resolution of 1973.
Explanation:
According to the United States Constitution, Congress has the right to declare war (Article I, paragraph 8) and the US President is Commander-in-Chief of the Armed Forces (Article II, paragraph 2). It is therefore unclear to what extent the President, as Commander-in-Chief, has the right to deploy armed forces in armed conflicts without the consent of Congress.
Background of the War Powers Resolution was the unclear constitutional situation in the use of armed forces in the Korean and Vietnam War. In the case of the Korean War, there was neither a formal declaration of war nor a congressional resolution approving the operation. After a Vietnamese attack on an American speedboat in the Gulf of Tonkin in 1964, Congress passed a resolution that supported the deployment of armed forces in Vietnam. It was not a formal declaration of war, but a publication as a law. The straw that broke the camel's back was the bombing of Cambodia and Laos ordered by President Nixon in 1970.
In 1973, the War Powers Resolution was passed by Congress with a two-thirds majority, following a veto by President Nixon. The goal was to ensure the future participation of Congress in the use of armed forces.