[Xeoncross]

Keep in mind that a modern US state is not the same as US state 200 years ago. At this point, the US federal government dictates substantially more of every aspect of a states rule: from education to exports, licensure to healthcare.

The US was an unique attempt at parallel state rule, but consolidation is always inevitable.

[MandieD]

However, the legal systems can still be wildly different. The ounce of marijuana that anyone over 21 can buy from a state-licensed shop and possess in Colorado could mean a $2000 fine and up to 6 months in jail in Texas.