The idea of racial unity is retarded because race is a social construction--it has no basis in biology. What most ignorant people who believe 'race' is rooted in biology mistake for race is merely phenotype--the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment. That said, the stubborness of the belief in the biological basis of race has caused some theorists to posit the idea that because people believe race is real it essentially is despite the fact that it has no basis in biology. Race is real only because historically white people made it real--so they could exploit people for material gain.