“Nathan Yau, a statistician who runs the blog Flowing Data, has made a series of gorgeous maps breaking down the population of America. The maps are part of his recent project to recreate the 1874 Statistical Atlas of the United States with the original design but 2013 data. Below are 15 of them that illustrate how the U.S. population got here. All of these categories are self-reported; the data is based on what Americans told Census workers about race, ethnicity and background.”