- The European Alliance was probably the successor of the European Hegemony which existed in the 21st century (TNG episode: "Up the Long Ladder") or was a colloquial/alternative term for it and/or the European Union. The Alliance was probably bordered by the Mediterranean Alliance. (TOS novelization: Star Trek: The Motion Picture)
Politically, there could be two ways in which the European Alliance functions. They are:
- A Confederation of European Nations.
- A full political union of European nations.