The European Union can be distinguished fundamentally from the previous European Economic Community in several ways, just as the Articles of Confederation can be distinguished on a fundamental level politically from the U.S. Constitution. Both Europe and America have made a qualitative jump, rather than merely as a matter of degree or further extent. In both cases, politically speaking, governmental sovereignty has been split between a union and state governments. Furthermore, in both cases, the domains of power being handled at the federal level have increased. In the case of the U.S., the coverage of the federal level has expanded well beyond Washington’s Continental Army. In the case of the E.U. even by 2024, the coverage had come to extend well beyond a common market and trade policy to include non-economic domains of power, or competencies, too. In this regard, the E.U.'s federal level resembles a government.
The full essay is at "The E.U.: Not a Trading Bloc."