WASHINGTON — Voters in Missouri cleared the way to undo one of the nation’s most restrictive abortion bans in one of seven victories for abortion rights advocates, while Florida, Nebraska and South Dakota defeated constitutional amendments, leaving bans in place.

Abortion rights amendments also passed in Arizona, Colorado, Maryland and Montana. Nevada voters also approved an amendment, but they’ll need to pass it again it 2026 for it to take effect. Another that bans discrimination over “pregnancy outcomes” prevailed in New York.

The abortion landscape, underwent a seismic shift in 2022 when the U.S. Supreme Court overturned Roe v. Wade. That ended a nationwide right to abortion and cleared the way for bans in most Republican-controlled states.

Meanwhile, Missouri is positioned to be the first state where a vote will undo a ban on abortion at all stages of pregnancy, with an amendment that would allow lawmakers to restrict abortions only past the point of a fetus’ viability — usually considered after 21 weeks, although there’s no exact defined time frame.

But the ban, and other restrictive laws, are not automatically repealed. Advocates now have to ask courts to overturn laws to square with the new amendment.

Florida, Nebraska and South Dakota became the first states since Roe was overturned where abortion opponents prevailed on a ballot measure. Most voters supported the Florida measure, but it fell short of the required 60% to pass constitutional amendments in the state. Most states require a simple majority.

The result was a political win for Gov. Ron DeSantis, a Republican with a national profile, who had steered state GOP funds to the cause. His administration had investigators questioning people who signed petitions to add it to the ballot and threatened TV stations that aired one commercial supporting it.

In South Dakota, another state with a ban on abortion throughout pregnancy with some exceptions, the defeat of an abortion measure was more decisive. It would have allowed some regulations related to the health of the woman after 12 weeks. Because of that wrinkle, most national abortion-rights groups did not support it.

Voters in Nebraska adopted a measure allowing more abortion restrictions and enshrines the state’s current 12-week ban and rejected a competing measure that would have ensured abortion rights.

Arizona’s amendment will mean replacing the current law that bans abortion after the first 15 weeks of pregnancy. The new measure ensures abortion access until viability.

The Colorado measure exceeded the 55% of support required to pass. Besides enshrining access, it also undoes an amendment that barred using state and local government funding for abortion.