So I was looking through all wild things excellent guide to region tags here https://www.nationstates.net/page=dispatch/id=1379609 trying to find what we call future tech that's not very scifi-ish.(turns out NFT is monkey money, not an acronym for near future tech) anyway...
We have invader/defender/neutral for gameplay alignment
We have imperialist for regions which try to to make an empire of other regions,
We have independent, for regions which maintain their independence from any empire(or from a broader gameplay alignment)
We don't have a tag for regions which are not independent, but instead property of another region hence; colony.
If nothing else, with imperialism on the upswing, it will give us something to fight over.