Answers (1)
Great Britain has invaded 220 countries and established lots of colonies, so you need to name the colonies in which you are interested.
There is no country called "Britain". That is a manufactured name, back formed from "British Isles" in 1922. The country you are thinking of is United Kingdom of Great Britain and Northern Ireland, which includes several nations and political jurisdictions. The largest nation in the group doesn't even have a name.