The reason that communism thrives in racially homogenous societies like North Korea, 20th century Russia or China is because it requires people to believe that

The reason that communism thrives in racially homogenous societies like North Korea, 20th century Russia or China is because it requires people to believe that everyone is roughly equal and that they only have different economic outcomes because the bourgeois conspire to hold the proletariat down. In a multi-racial society like the U.S, people are less likely to believe that because of racism. This is why libertarians and racists are often strange bedfellows because they oppose communism together, but for completely different reasons. They would probably be sworn enemies in a racially homogenous society.