One debate that metaphysicians of race have been consumed with since the 1990s is what we can call the US race debate, which is the debate about what the nature and reality of race is according to the dominant ways that ‘race’ and race terms are used to classify people in contemporary American English. In 2014, I contributed a defence of biological racial realism in the US race debate that utilized new results about human genetic clustering from population genetics. In this paper, I will show that all US race theories have been wrong, including my own. This is because, as I will argue, the correct US race theory has a radically pluralist form. This is an instance of a metametaphysical position that I call radical racial pluralism. After defending radical racial pluralism in the US race debate, I explore valuable implications of the view for philosophers of race.