You're kind of asking what's the point of having states and that's a fair question, but one that's been long decided. As long as you've got states with the powe

You're kind of asking what's the point of having states and that's a fair question, but one that's been long decided. As long as you've got states with the power to make their own rules, people who want to live in and do business in those states will have to follow those rules (this is theoretically one of the biggest benefits of states existing).