If the War Powers Act had been in effect during President Truman's administration, it would have required him to notify Congress within 48 hours of deploying troops and to obtain congressional approval for keeping troops in combat beyond sixty days. President Truman, however, deployed soldiers and committed resources to the Korean conflict without a formal declaration of war or congressional approval, relying on the executive's foreign policy powers and the public's support at the time. After the Vietnam War, the War Powers Act was passed to restore some degree of congressional oversight. Nevertheless, many presidents, including Truman had the pattern of asserting executive authority in foreign conflicts, effectively minimizing Congress's role in declaring war as designed by the U.S. Constitution. This expanded presidential power continued into subsequent presidencies following Truman's, often resulting in military engagements without explicit, prior congressional authorization.
The War Powers Act, enacted in 1973, would have limited President Truman's ability to deploy troops in the Korean War by requiring congressional notification and approval for troop engagement beyond sixty days. However, during the Korean War, Truman acted without such limitations, relying on broad public and congressional support for immediate military action. Had the Act been applied, it may have delayed his response to the North Korean invasion.
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