> I doubt EU would be willing to do the same things US did to maintain its grip.

I think you meant war.

I think the EU is unwilling to make even non-bloody sacrifices, like the US did in the beginning at the Connecticut Compromise (1787). Basically as early as 11 years after the independence, the large US states relinquished a lot of power to the smaller states. With that compromise they gave 2 senators to each state, no matter how big or small it was.

I really don't see Germany relinquishing that much power, or France for that matter.

Also the EU cannot function like the US without the absolutely massive transfer of cash from rich to poor states.

A poor state in the US receives as much as 10k per person NET from the federal government https://worldpopulationreview.com/state-rankings/federal-aid... Imagine giving out 200 billions to Romania alone every year... At best we get 10 billions a year, but only for a limited time. In the previous budget we got like 3-5 billions a year. For those funds, the richer countries expect a lot of obedience in return, always dangling the threat of cutting the funds if we "don't behave".