we are all indigenous people.

That is something that you have in common geographically. That is not the defining feature of a race in the way you're choosing to define it for others. I'm sure if you asserted everyone with origins in Afro-Eurasia were the same race because it was the same landmass before the construction of the Suez you would be met with similar confusion. Color alone doesn't conform to what you're saying either.

I feel like you're saying things I would agree with but you're phrasing it in a way that makes it become nonsensical. Like Polynesians in the US can be perceived as black, but the idea that Tongans and Zulus are the same race in any sense other than them both being humans is bizarre and sounds like it comes out of the head of an anthropologist from the 1800s.