For example, Pennsylvania’s 2010 redistricting ensured a Republican grip on 13 of the state’s 18 congressional districts, despite elections where Democrats got more votes for Congress statewide. A Brennan Center analysis estimated that the last round of gerrymandering landed the GOP an additional 15 to 17 House seats in all. And partisan gerrymandering disproportionately affects communities of color, especially in the South. Because of residential segregation, it’s easy to either combine or split apart those communities for political effect.
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