Voting Rights Act ruling

[NiKKoM]

Today, the Supreme Court tossed out Section 4 of the Voting Rights Act, the key 1965 law meant to prevent disenfranchisement of minority voters. Section 4 says states and other jurisdictions that have sufficient histories of voting discrimination have to go through what’s called “preclearance” under Section 5 of the law whenever they redistrict or otherwise update their voting laws. Currently those jurisdictions cover most of the South but also Manhattan, Brooklyn, some counties in California and South Dakota, and towns in Michigan.

So can someone explain the ruling from today? Why? How? Wtf?