Darwin helped put an end to polygenesis

Polygenesis is the idea that the races are so different that there must have been created separately by God.  Ken Ham has argued for a while that the Bible teaches one race, but this has not always been the consensus.  Thanks in large part to Darwinian evolution, polygenesis did not survive the 19th century.

Finally, we may conclude that when the principles of evolution are generally accepted, as they surely will be before long, the dispute between the monogenists and the polygenists will die a silent and unobserved death. ~ Darwin - Descent of Man