In a highly-anticipated 5-4 decision today, the Supreme Court struck down a key part of the Voting Rights Act, ending nearly a half-century of robust federal supervision over the election procedures of states with histories of racial discrimination.

At issue in Shelby County v. Holder was the Act’s requirement that certain states and districts obtain federal approval, in a process known as “preclearance,” before changing their election laws. To determine which areas of the country would be “covered” and therefore subject to preclearance, Congress in 1965 wrote into the Act a coverage formula, also known as Section 4. This formula asked whether a jurisdiction had a voting test in the 1960s or 70s, and had low voter registration or turnout at the time; if the answer was yes, then that jurisdiction was covered.

In 2006, Congress renewed the Voting Rights Act without making any changes to Section 4. Shelby County, a covered jurisdiction in Alabama, challenged the constitutionality of the Act. Today, a majority of Justices agreed that the coverage formula “can no longer be used as a basis for subjecting jurisdictions to preclearance.” Chief Justice John G. Roberts’ majority opinion left it open to Congress to re-write a new coverage formula, but as Rick Hasen of the Election Law Blog notes, this is highly unlikely given the degree of polarization in today’s Congress. As it is, invalidating Section 4 effectively strips the Voting Rights Act of most of its power.

Collectively, the majority opinion, concurrence and dissent run 68 pages long, but I’ve assembled some highlights from each Justice, which you can read by scrolling over the graphic below. Each dot will open up a box that shows key quotes from that Justice: one (or two) from the March oral argument, and one from today’s decision (if the Justice wrote an opinion, concurrence or dissent). The red dot indicates the author of the majority opinion. The yellow dots indicate the rest of the Justices who were in the majority, and the blue dots indicate the dissenters.