Ethiopia/Pan-Africa isn't quite a superpower. That is one of those situations where I am active enough that it makes Pan-Africa/Ethiopia one of the more important places in the story, but that doesn't necessarily translate to political power. The defining feature of a superpower - the ability to project power - is completely absent in Ethiopia, which at this point doesn't even have a formidable navy anymore.

China and Spain are the superpowers - both have shown as much by projecting power across the globe. China has interfered in the Americas, Russia, and as far away as the North Sea. Spain has interfered in the Americas and has fought for influence in the middle east. At this point, those two nations represent the ying and yang of the RP - capitalism versus communism, colonialism vs self-determination, western culture vs native culture, etc. 

...and there is no USSA. We nixed that. It is just the USA again.