The provision of the Constitution giving the war making power to Congress was dictated as I understand it by the following reasons. Kings had always been involving and impoverishing their people in wars.
It officially became part of Denmark in 1953, though since then Greenland has been granted a lot of authority to govern itself making its government autonomous.
In addition to this welcome they had a request to make of him: would he accept the title of Chief and visit their reserve to give them the opportunity of conferring?
They argue the president's claim that trade deficits with other countries is a national emergency is baseless, and they say that Congress has not delegated that power to the White House.
The third standardizes what happens if the President becomes incapacitated, and has to temporarily grant power to the Vice President, which has most commonly been used for medical reasons.
And the difference here is that he decided to step away and step down from the powers that would have been granted to him, which is really interesting.