[dcwusmc]

Try reading the Tenth Amendment. If an authority is not specifically GRANTED, then it is prohibited to government. So, YES, it is prohibited.

[wideawake]

Try reading the Tenth Amendment.

Try comprehending it.

If an authority is not specifically GRANTED, then it is prohibited to government. So, YES, it is prohibited.

However, the Constitution specifically forbids the States to conduct warfare or foreign policy and it specifically empowers the President to conduct warfare and it specifically empowers the President and the Senate to conduct foreign policy.

So if the President of the US sees fit to demand the German Reich's unconditional surrender before he ceases prosecuting war against it, the Constitution empowers him to do so.

And if the President and the Senate see fit to impose a peace treaty upon the German Reich that obligates it to adopt a representative form of government in order to reestablish peaceful foreign relations with the United States, the Constitution empowers them to do so.

Even an advocate of the anti-Constitution "strict construction" school of Constitutional interpretation cannot rationally argue that the Truman administration acted unconstitutionally vis a vis Germany, Italy and Japan.