>>17797439
Ok, that graphic seems to be a tad bit inaccurate. I found this nuance in another video: R1a is the brain that went into the northern steppes. The Ukrainians and the Yamnaya are R1a.

On the other hand, R1b moved into Bactria and then Mesopotamia, splitting off from the northern R haplogroup. They settled Mesopotamia as early as 20k BC per this video.

https://www.youtube.com/watch?v=lc3q1TK57wE

I'm wondering if there was an R1a vs R1b rivalry. Obviously, it's the R1b native terrain where cities emerge, and it's the R1a terrain where raid warfare emerges.

Additionally, if we assume early humans could have had transoceanic ability, then this also potentially explains that. R1b is by the ocean, R1a is not. R1b is also found in northeastern native americans (see: https://en.wikipedia.org/wiki/Genetic_history_of_the_Indigenous_peoples_of_the_Americas). Authors say " R1b was most likely introduced through admixture during the post-1492 European settlement of North America", but I'd remain skeptical of that unless proof was somehow provided.

Extrapolating a bit further, this would mean that R1b are Atlanteans, and R1a are Aryans.