[Symbiote]

Each US state also has

- its own laws and constitution, search "Constitution of California"

- its own taxation (e.g. sales tax differs between states, just as VAT rates differ between EU countries; Americans pay income tax to their state as well as the federation)

- its own policies for education, healthcare (not sure about social security, and not for trade)

- some US states have border disputes with other states, e.g. Tennessee vs Georgia (Possibly the EU does not, they must be resolved before joining, though I can't find a good article on this).

- the USA as a whole has border disputes with Canada

The EU presents more division on more topics than the USA, but the USA isn't united on e.g. energy policy.