Well, they have been killing the heck out of each other in Africa for generations. There always seems to be more of them though, and it’s always someone else’s problem to fix ( not their own). Time to build that wall.
http://erectuswalksamongst.us/Chap11.html
If you look into K and R survival strategies if tells you part of what is going on. Blacks are more R and whites are more K. Asians are the most K
They have had 1.8 million years to achieve something, anything in Africa.