The diversity index in this study is based on the Simpson's Diversity Index, where we rank each county on the probability of randomly selecting two people and getting two people of different races: D =1 - ∑(n-N)^2 where n = number of people of a given race and N is the total number of people of all races.

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The polarised race map of America
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Alex E

“Maps are like campfires – everyone gathers around them, because they allow people to understand complex issues at a glance, and find agreement about how to help the land.”