The researchers' mathematical model suggests that of the seven states in the country with the highest percentage of people who are biased against black people, six are Southern states—Louisiana, Mississippi, Texas, Alabama, Georgia, and South Carolina—required to seek federal approval for election law changes under the Voting Rights Act. Arizona and Alaska, the other two states required to get the feds' permission before changing their election laws, ranked much lower in anti-black bias. But as Elmendorf and Spencer note, these states are presumably required to seek that permission because of other bias—anti-Latino in Arizona and anti-Native American in Alaska—which their study did not measure. (Besides the eight states mentioned above, the VRA requires some counties and municipalities in seven other states to seek federal permission to change election rules.)
The researchers crunched the data several different ways to make sure they were getting valid results. But "whichever approach you pick, the Deep South states are close to the top," Elmendorf says.
This Study Said the South Is More Racist Than the North | Mother Jones