“Repurposed NASA maps show the racial diversity (and segregation) of the United States in more detail than ever before.”
This interactive map of population density in the United States also shows ethnic categories as defined by the U.S. census. Please explore this map at a variety of scales and in distinct locales.
Questions to Ponder: Is this a map of ethnic diversity patterns or is it a map of racial segregation? How come? Is there additional information that you would need to decide? This review of the map on Wired and Atlantic Cities described this map as a map depicting segregation: why would they say that?