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The EU Parliament only has the powers that have been given to it by the House of Common. The House of Commons is the sovereign. [1]

[1] - https://www.youtube.com/watch?v=USTypBKEd8Y

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And the U.S. federal government has only the powers devolved to it by the sovereign states. But its hard to say U.S. states retain any meaningful sovereignty today.

But US States can't leave the union (although they can change the constitution).

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