The Supremacy Clause of the U.S. Constitution
is contained in Article VI:
This Constitution, and the Laws of the United States
which shall be made in Pursuance thereof; and all
Treaties made, or which shall be made, under the
Authority of the United States, shall be the supreme
Law of the Land; and the Judges in every State shall
be bound thereby, any Thing in the Constitution or
Laws of any State to the Contrary notwithstanding.
Are you saying that the President of the U.S. along with the Consent of the Senate, can dissolve the states by making a treaty with a nation who doesn’t like our form of government? Or can impose a form of government which is not a republic? Because that is what you are implying. A treaty is a law. A law can be repealed by the legislature and the President by using another law. Only the states can modify the provisions of the Constitution. And it takes a lot of them.(In reality, 5 idiot members of the Supreme Court can overturn the Constitution, because we let them.)
The Constitution is the highest Authority, and all laws and treaties must abide by its restrictions, else they are unlawful.