Providing a military, framework for a court system, maintaining national sovereignty, and that's about it.
If this were the 18th century that still would NOT be enough governance to maintain an effective nation.
That's why the Floundering Fathers wrote the consitution we have right now, as a matter of fact.
What they had, that confederation of States and a very weak government (like the one you're describing) failed.
You ought to read some US history, Dude.
The talking heads you must be depending on to give you a POV are idiots.
Failed? The USA failed prior to the New Deal?
Don't be obtuse.
It makes it even more difficult for us to differentiate when you're merely misinformed, versus you're simply being stupid.
The USA failed as a nation state BEFORE 1789.
Hence the FF wrote a constitution to give the FEDERAL government more powers than it previously had.