For more than 25 years, abortion opponents unable to overturn Roe v. Wade have been building ever-higher barriers to a woman’s right to an abortion. On Thursday, in the most far-reaching abortion ruling in a generation, the Supreme Court in essence told them, “Stop, you’ve gone too far.”

In its 5-3 decision, the bitterly divided court struck down parts of a Texas law that had already closed half of the state’s abortion clinics, and if allowed to go forward, would have left the nation’s second largest state with less than 10 clinics to serve 5.4 million women of reproductive age. By contrast, California, the nation’s most populous state, had 160 abortion clinicsat last count.

Texas is one…