It would indeed be less confusing if states weren’t allowed to make their own laws concerning state matters. Basically it would do away with states altogether.

It would also be a violation of federal law, specifically the Constitution of the United States which gives certain specified powers to the federal government and reserves the rest to the states.

So if you want to do away with the power of the states to make their own laws, you first need to throw out huge chunks of the Constitution. This would require an impressive amendment.

To propose your amendment, you would need two-thirds of both houses of Congress to vote to propose it, or two-thirds of the state legislatures to ask Congress to call a national convention to propose it. (Since doing away with states would also do away with the Senate, persuading them would be interesting.)

And then to ratify your proposed amendment you would need three-fourths of the state legislatures to approve it, or ratifying conventions in three-fourths of the states to approve it. (just in case the legislatures didn’t agree they should also be eliminated but the people did)

Lots of luck. Just please remember all laws should written as if they will be enforced by your worst enemy, because at some point they probably will.

David doubting we need more laws
or more powerful, distant government