Black Americans experience dramatically lower upward mobility than white Americans do -- a difference that appears to be driven largely by significant economic disadvantages among black men. This conclusion comes from a groundbreaking study that combines Census Bureau data on race with IRS tax returns, which allows economists to track individuals' earnings over many years and tie them to their parents' earnings. The study compares intergenerational mobility, the degree to which children exceed or fall behind their parents economically, across different racial groups. This article from Vox highlights a few major takeaways from the new research.