Beginning in 1812 and for the next hundred years, US Presidents asked for and received congressional declarations of war against England, Mexico, Spain, Japan, and European powers. During the Cold War, President Harry Truman sent troops to Korea as part of a UN force without a congressional declaration of war. President John F. Kennedy sent troops to defend South Vietnam. Congress never declared war, but years later passed the Tonkin Resolution authorizing President Lyndon Johnson to use force against North Vietnam. In reaction to US involvement in Vietnam, Congress passed the War Powers Act which limited the President’s authority to commit American troops abroad without Congress’s approval. The law was passed over the veto of President Richard Nixon, who argued the law was an abridgement of the President’s authority as Commander in Chief. The Act raises the questions: How far does the President’s power as Commander in Chief extend? And, how much of that power can be limited by Congress?