As a practical matter, the Voting Rights Act helps one political party and hurts the other party. When a Republican legislature draws a gerrymandered map, Democrats will claim that the map harms African American or Hispanic voters. But when a Democratic legislature draws a gerrymandered map, Republicans will have a hard time raising a Section 2 claim that the map harms White voters. Illinois could gerrymander all Republican districts off the map, without any meaningful legal challenges. But if Mississippi or Louisiana tried to gerrymander all the Democratic districts off the map, there would be immediate legal challenges. Indeed, these southern states are forced to create "opportunity" districts to ensure minority voters can elect Democratic politicians.
This is the asymmetry of the Votin