For a century, incomes in the U.S. grew more equal among rich and poor states. But with more regulation leading to greater economic segregation, incomes in the poorer states are no longer catching up to incomes in rich states. (Illustration by Andrew Neyer | Column by Virginia Postrel on Bloomberg View) 

For a century, incomes in the U.S. grew more equal among rich and poor states. But with more regulation leading to greater economic segregation, incomes in the poorer states are no longer catching up to incomes in rich states. (Illustration by Andrew Neyer | Column by Virginia Postrel on Bloomberg View