[M2Ys4U]

>Indeed, EU members lack the sovereignty even of U.S. states.

Unlike the US, EU member states are free to leave if they wish. See also: Brexit.

[duxup]

I feel like "you're free to leave" is not a good response to most issues with government and member states. It misses the point of the question if the law or structure in question is appropriate.

I get what you mean by a difference between a US state and the EU... but that difference doesn't address the issue.