Most and Least Diverse US States

Using the Census-reported racial categories of White, Black or African American, Native American or Alaska Native, Asian, Native Hawaiian or Pacific Islander, and Other

Higher diversity is defined as a lower standard deviation in the percentages of each of these groups, on a scale of roughly 0 to 37

TL;DR a more diverse state will have a more even split of its racial groups

From http://tiny.cc/bq5v001