These several States decided among themselves to institute a Federal system so that Commerce between themselves can be regulated by THEMSELVES and not a King. It was a declaration of sovereignty of the Colonies, to become State actors.
These Actors decided the System. Each of the Founders were not from the USA. They made that. They were from the various States and in order to form a Union, blah, blah, blah.
And States then Declared a Federal System so the common defense can be seen to. And it is the States that Regulate the Federal Govt, not the People. But, even that is balanced, by voting next time.
We People are in Self Rule in our Counties and in that way WE Regulate our States, by voting next time.
If you think different, you fell for the Anti-Con.