In my sci-fi book there is a faction that is a Federation (so original right). So a bunch of Colonial Sectors joined together under a federal government to fight against a much more powerful faction. Hundreds of years have passed wars won and lost, planets taken and retaken, and the people on both sides becoming ever bitter about the other. The federal government knowing that a divided was present used it for its own gains. The government made it that your Cultural Identity wasn't based on your race or creed (all were very watered down anyway) but based on the government you were born under. So how would people identify as being one. I know that it would be a broad sweep like John Doe is a Federation citizen, But I'm stuck on name they would use abbreviations and all. like would outsiders call them Federals, Feds, and Federations list goes on. The idea comes from the way the cold war went about putting everybody under one group like commies and capitalist, just that each side embraced the name.
The Question: What would be the right Cultural Name of People that Identify being from a Federation