Eh, I'm fine with more Americas myself. Especially since they're often the weirdest.The only reason I wouldn't go with it is because I think EEUSG has way too many America entries as it is. I do remember AAPA's American Empire trying to create a "master race" through mixing races and getting the "best racial traits" out of all of them.
Alternatively, Mexico. Reacting to the colonial caste system by promoting a mestizo-first system?