The Supreme Court on Friday eliminated the constitutional right to obtain an abortion, casting aside 49 years of precedent that began with Roe v. Wade. The decision by Justice Samuel Alito will set off a seismic shift in reproductive rights across the United States. It will allow states to ban abortion, and experts expect about half the states to do so.

In one of the most anticipated rulings in decades, the court overturned Roe, which first declared a constitutional right to abortion in 1973, and Planned Parenthood v. Casey, which re-affirmed that right in 1992. The decision followed the leak in early May of a draft opinion showing that a majority of the justices were privately poised to take that step. On Friday, they made it official.

The vote to overturn Roe was 5-4. Justices Clarence Thomas, Neil Gorsuch, Brett Kavanaugh, and Amy Coney Barrett joined Alito’s opinion. Chief Justice John Roberts did not join the opinion. He agreed with the majority that the Mississippi abortion restriction at issue in the case should be upheld, but in a separate opinion, he argued that the court should not have overturned Roe.

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