"Several contributors offered what they believed to be the best arguments for grounding (or rejecting) the abortion right using constitutional materials available in 1973. Some tried to improve (or, in the case of the dissenters, demolish) Justice Blackmun’s arguments that abortion was a constitutionally protected liberty. Others decided to ground the abortion right in the Equal Protection Clause, taking advantage of the fact that in 1973 the Court’s sex-equality jurisprudence was still relatively unformed and could have been fashioned differently from the way it is today. None of the opinions adopted Justice Blackmun’s original trimester framework."