The European Coal and Steel Community wasn't meant to be a political federation, as the name shows. Nor was the European Economic Community to give it its full name.
The concept of the ECSC/EEC/EU as a political federation was always a goal of some small number of federalists (mostly in the beginning communists who were imprisoned on Ventotene during the war), but they didn't have any support for that from the people of Europe themselves, which is why the history of the EU is full of the people building it saying explicitly that they have to lie about their true intentions and can only expand its powers during a crisis.
Certainly there was absolutely no intent anywhere immediately after WW2 to create a political federation. Far from it.
