[retrac]

There was another but we're still grappling with it. Nuclear weapons, and modern weaponry, the needs of real-time modern war, have transferred powers to the Executive that did not exist before in practice. It was never intended, after all, for the President to, semi-literally, have a button to press that ends the world. It arose dynamically out of a changing response to the needs of the early cold war, and has become effectively part of the unwritten constitution, without it ever really being explicitly considered how it should fit into the puzzle.