The question of who gets to make war has been one of the most disputed questions between the Presdiency and and the Congress.The last time Congress declared war was in World War II. As far back as President Washington President have used their perogative as Commander of Chief to lead the army into war. There have been hundreds of times when the US military has been used without authorization. Since the Vietnam War, the war making powers of the Presidency have been limited by the War Powers Act, which required the President to notify the Congress when US troops were intruduced into areas of confilcts. the President has 60 days to act and another 30 days to pull out troops unless he receives Congressional authorization to continue the action.