By then, both parties had abandoned a political settlement necessary to the stability of the Republic—equal rights for women—and descended into a politics of seemingly interminable division that would outlive nearly all of the people who had been its architects, including Phyllis Schlafly, whose last public act, in 2016, at the age of ninety-one, only months before her death, would be to endorse Donald J. Trump as the nation’s next president.