I think one of the explanations I once heard is that we have a lot of things locked up in our genetics and the environment we're born in (access to clean water, shelter, environmental like heat or extreme cold etc) is critical to unlocking higher intelligence.

Given that races themselves are an evolutionary trait to the environment they are in, it isn't that crazy to believe there is a difference in Intelligence based off race but the question is how much of that can be mitigated by environment as I doubt them growing up in leftist shitholes like Baltimore or totalitarian places like North Korea assist with this.