Article I grants to Congress, and the Vesting Clause does not reassign those powers to the President. In fact, because those actions require legislation passed by Congress which must be signed by the president to take effect, those powers are not strictly executive powers granted to or retained by Congress per se. Nor were they retained by the U.S. Congress as leftovers from the Articles of Confederation. The Articles of Confederation, Continental Congress and its powers were abolished at the time the new U.S. Congress was seated and the new federal government formally and officially replaced its interim predecessor. And although the president is implicitly denied the power to unilaterally declare war, a declaration of war is not in and of itself a vehicle of executive power since it is literally just a public declaration that the U.S. government considers itself "at war" with a foreign political entity.