To anyone who does not get the irony in the above, this already exists as the Tenth Amendment. It is effectively ignored because it is considered legally redundant with the Constitution itself.

I disagree if it was effectively ignored, a lot of things would be better and alot of things would be worse. While the lines between state and federal power has even diminished, it’s very much still there.

I originally assumed you were a dumbass here, not a smartass. well played.

The interstate highway system and the freedom of movement between the states greatly restricts the ability for states to have meaningfully different policies from one another. A popular policy that works for the current population of the state may become an economic disaster once residents of other states move in to join the action.

That's why it's the Eisenhower interstate system. They could have passed an amendment, but instead they jammed it in as part of national defense.