Humans are still a worldwide threat, so it would be unlikely they would only have America left. The capital of the human empire would be somewhere there. It would be like how great Britain conquered quite a bit during it's empire years. They took advantage of the chaos to gain a lot of control to form what is desired to be a worldwide human empire and put down all of the animal rebellions. Some countries willingly joined to become part of this insanely powerful human alliance. Other human settlements will be like barbarians, Vikings, etc. Still very dangerous to the animals. The human empire will have steel armor, crossbows, and various melee weapons but no guns. Although maybe armor is rare?

We can fight the human empire in brazil, maybe, which they had taken over? Or any other location ideas around that area?

You can take the evil animal leadership position. Either of those ideas sounds really cool, at least as cool as my honey badger idea. If they join the evil animals then we're in trouble. 

We can have control over some humans, yes.