This week, the U.S. Supreme Court will hear arguments in one of the most important cases on reproductive rights in decades. Jackson Women’s Health Organization, the last remaining abortion clinic in Mississippi, has challenged a state law that would ban abortions after 15 weeks of pregnancy. The Supreme Court case could determine not just the fate of the clinic, but of the monumental 1973 ruling Roe v. Wade, which legalized abortion nationwide. Today, legal historian Mary Ziegler breaks down the Mississippi case, and explains what its potential impacts could be for reproductive rights across the United States.