The increasingly diverse United States of America – “The racial and ethnic diversity of communities varies greatly across the country, but rapid change is coming to many of the least-diverse areas. These are just some of the ways….To quantify how America is changing, we used the diversity index, which measures the chance that two people chosen at random will not be the same race and ethnicity. A high score means a county has people of many races and ethnicities, while a low score means the community is made up of a single dominant group. To make these maps, we calculated the racial and ethnic diversity in every county in the contiguous United States for 2000, and again with the latest data from 2014..”

• See also Diversity Explosion How New Racial Demographics are Remaking America By William H. Frey November 19, 2014.