>>17872979 (OP)Race. Intelligence is highly heritable, even within a race we see social darwinism take place and the wealthy ruling classes as well as other groups like "middlemen minorities" (jews) having high IQ.
In modern media you often see a trope where some underdog sticks it to the preppy rich kids, but in reality, even with all the revolutions, welfare and socialism, people generally stay within their prescribed tribe.
Similarly in politics people vote by race. The Vietnam war wasn't about achieving utopian communism, it was about Vietnamese nationalism, as was the great patriotic war. Even in the "diverse" individualistic west, about the only group that does not vote by race are the white leftists. Even minorities who screech all day about "racism" will vote for their race because "he look like me!"
Blood is thicker than war, a race prefers exploitation by the ruling class of their own race than equality if it means someone outside their race gets elected.