On Wednesday morning, the Supreme Court issued its long-awaited decision in Louisiana v. Callais. As many had feared, the decision all but eviscerated the most important remaining pillar of the Voting Rights Act.

As a direct consequence, Republicans in eight states have the chance to gerrymander more than a dozen congressional districts that were drawn to prevent discrimination against minorities—all of which are held by Democrats.

Below, we identify the districts that are most at-risk, and why.

The demise of Section 2 of the VRA, which prohibited states from unlawfully splitting members of racial and language minority groups between electoral districts as a way of diluting their voting power, will have a profoundly adverse impact on voting rights and will make American democracy even less representative than it already is.

And its effects will be felt far beyond Congress. Maps for state legislatures, county boards, city councils, and countless other governmental bodies have, since the VRA’s passage in 1965, all been required to comply with the Act. They, too, risk getting eviscerated in the coming years.