It was a pretty messy war. Most of South America is held by the Votanis Collective. The Earth Republic held North America, a great deal of Europe.

Earth Republic is currently dissolved, still mostly humans there, though.

It just got divided up in the normal, post war way. People don't usually hold hands and sing kum ba ya after those sorts of things. But they get along better than expected, and I live in one of the freely mixed areas... the first, actually.