This wasn't funny the first 468th. times.
Ehm... answer is pretty fucking simple: humans did not go through selective breeding, dogs did. Dogs are the argument why there is only one human race. Image we do the same for Humans. Lets take the Poles. Imagine you clasify what the archetypical Pole is. White, strong,... then you start breeding them, only oure blooded poles with other pure blooded poles. Continue that for 390 years and you have a subrace of inbred, retarded Poles with a shitton of physical deformities.
Science is racist!
Oh look, it's feeding time for the alt right
Problem: you don't understand anything regarding a complex system in reality Solution step 1: use extreme simplification so even you can understand it step 2: note that people of competence come to conclusions that don't fit in your simplification step 3: declare yourself smarter than said people of competence who studied this topic for most of their lifes step 4: feel super smart
sooner or later yall gonna have to accept that people aren't equal, they're not born equal, they don't have the potential to be equal, (nor do their "stats" somehow add up to the same numbers, some people roll all 4s some roll all 8s - deal with it). and to pretend that has nothing to do with genetics is insane.
In humans It's not usually the intelligence diffrence between being able to open a door or not. Iq 20 vs 120. The issues at hand between people of diffrent culture, areas etc. are what opportunities they have to learn diffrent skills and common knowledge. Their view of the world and their place in it. A person that grew up in a small shack in a third world country for example are not less smart then someone that grew up in New York the diffrence is what kind of knowledge they each possese. You can have an extremly high IQ but if you did not have the opportunities to nuture that IQ you wont amount to anything special. Also religion usually makes people close doors to important knowledge which usually makes religous people look more stupied. If u read all of this you're as bored is I am, fuck covid