"During the years before January 22, 1973, the day on which the Supreme Court decided Roe v. Wade and proclaimed that the Constitution protected a woman’s right to decide whether to bring a pregnancy to term, Americans conducted a vigorous debate about abortion’s morality and meaning. It is obvious today that the Supreme Court’s decision did not end this debate. Neither, of course, did the Court start it—although public discussion of Roe v. Wade implies not infrequently that it did."