The US by and large can (and does) assert authority outside of its jurisdiction, from which another country can choose to capitulate.

Most of the time countries do, because they are all swapping data on their citizens between themselves to skirt various laws.

In the case where the US really wants something, and the country won't yield, they'll fund contras or destabilize the government (if small enough to be bullied) or impose sanctions so drastic it's effectively a soft act of war.

This is all to say that, the US has nearly unlimited authority while it stands as the world's defacto superpower.

The unfortunate truth, 300,000 years later and humans still operate on "might makes right" whether militarily, or economically.

If the violent, untrustworthy, Americans choose to go to war with their former allies over some data then that's their choice. Better than just giving these warmongers everything they want.

They can assert what they want, they have no way to enforce it.

Pretty funny you're jumping straight to warfare. This proves why Americans cannot be trusted.

In any case, it's better for me that the Americans will need to start a war with the EU to get at my data instead of just giving it to them.

We agree, I'm not saying anything is good or desirable. Just pointing out, this is how they achieve overreach: coercion.