No such thing happened in “Europe”. Giving away sovereignty (which is what the politicians did, not the people) is not sharing it; it is becoming a client state to the superior power. Overt lesson of history, but mankind, as Churchill noted in 1935, suffers from “unteachability”. Even worse, the trap thereof is socialistic.
Churchill only approved of a united Europe “built by the English”. He recognized two other powers capable of doing so, those being Russia and Germany, but his viewpoint was that their constructs would lead to dystopia in both cases.