Nice new badge there, GP!

I'm not sure if that kind of map has a specific name. Perhaps we should give it one ourselves. Political time lapse map? Imperial expansimation? (That's expansion crossed with animation.)

Ooh! Then we could turn it into a verb: I like the way you expansimated that map. And we could have a new specialty among cartographers: "What do I do for a living? I'm an expansimator."