Agreed. France and Ukraine are no more different in language, geography, culture, what have you, than states as Massachusetts and Connecticut.
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I meant only in the context that have combined transnational institutions like the ECB/Euro, joint defense operations/contracts/equipment, the EAZA, even the EU itself. Combined with the relative size of the populations and economic blocs that in certain contexts yes European countries in the EU are like states in the United States in that sense.
So the only way to compare based on size is based on the entire EU (though the EU has more people 500 mil vs 300 mil but similar sized economies.
And while the US does have a lingua franca (but not official languages like the EU does) we do have a vast many cultures. Connecticut and Massachusetts are different states but are in a culturally similar area. Now say Hawaii and Alabama or Maine and Nevada those are basically as different cultures as crossing borders in the EU.
Of course I know you as citizens of Denmark Germany or the Netherlands never want to lose that culture (and who would they are very rich deep historical cultures) - economic and political ties will eventually turn into cultural ties.
In fact I see the EU's problems (especially with the Euro and separate countries deficit/spending habits) are simply reflections of the problems of the pre-Constitution US under the Articles of Confederation.