If the voting rights act is overturned, what will be the practical results?
As I understand it, the entirety of the Voting Rights Act won't be overturned. It's only a particular section that may be overturned.Since just after the Civil War, the Constitution has said that states can't prevent people from voting based on race (or otherwise design voting procedures so as to magnify or diminish the effect of people's votes based on race).
But a few southern states kept enacting voting barriers, such as literacy tests, that disproportionately affected blacks (and later Hispanics).
The problem was that by the time such barriers were challenged and struck down, the election was already over and the harm already done. There'd be new, different barriers in place before the next election. Rinse, cycle, repeat.
So the Voting Rights Act was enacted, and it contained a few different provision. Section 2, which applied to all states, said that states can't discriminate based on race when it comes to voting. Pretty much the same rule as before, and the same problem: by the time a case was litigated, the election was already over. Hence Section 5.
Section 5 applied only to Racist States*. It said that a Racist State can't change its voting procedures until after any proposed change is reviewed by the federal government. This prevented the rinse-cycle-repeat way around the law. States couldn't keep enacting new barriers as soon as the old barriers were struck down. Instead, any new barriers were ineffective until after they were approved as being non-racist. Suck it, Mississippi!
Section 5 was originally supposed to be in place for only five years, but it's been renewed a bunch of times since then, most recently in 2006. It's the 2006 renewal that is now being challenged under the theory that there's no longer a need to distinguish between Racist States and Non-Racist States, or something like that. I don't know the details.
I don't know what the practical effect of repealing Section 5 would be now.
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*Section 5 didn't use the phrase "Racist States." Instead, there was a formula contained in Section 4 for determining which states Section 5 applied to. It was based on facially neutral factors, like "jurisdictions where more than 50% of the population drinks sweet tea, wears wife-beaters, watches NASCAR, and drives pick-up trucks with over-sized tires and a shotgun rack." But everyone knew it was targeting the south.