I've long been a promotor of states really experimenting and trying out all kinds of stuff in order to help identify what's best - in all areas.
But in pondering that today, I second guess myself. I'm fearful each state, if given enough rope to do so, will possibly hang itself.
And I can make examples from both extremes here as an argument against total state freedoms.
Do we really want Alabama to "Alabama" as much as it can? I'd argue no.
It also wouldn't be good for California to be as 'California' as it can.
I'd argue Texas shouldn't Texas to the extreme, but I think it already is.
I think people forget that Federal reach acts as a sort of social and economic gravity, pulling each state back towards the middle.
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Another thought I had is to treat counties as we do states. Maybe to avoid a future civil war between urban and rural, just have counties' rights be the ultimate law of the land. That way, if you are unhappy with your county's politics, it's easier to move to a nearby county compared to moving entire states away. Or you could drive over for services you want, but aren't available in your county.