This chapter lays out the book’s central thesis that Supreme Court decisions changing previously prevailing interpretations of a mostly unaltered written Constitution represent the historical norm, not an exception. The chapter begins by discussing the death of Justice Antonin Scalia in February 2016 and the changes in constitutional doctrine that Scalia, who had pioneered the interpretive methodologies of originalism and textualism, had helped to bring about. The chapter also highlights changes that Scalia had urged but could not persuade a majority of his colleagues to adopt. It describes the political machinations by a Republican Senate majority in the aftermath of Scalia’s death and the similarly partisan maneuvers that resulted in the swift confirmation of a successor to the iconic liberal Justice Ruth Bader Ginsburg in 2020. Together, these developments helped produce the Court’s current supermajority of six conservative justices (out of nine), including three appointed by Donald Trump, and inaugurated a new era in constitutional history. After sketching this background, the chapter preliminarily sketches some of the book’s most important themes, including that the Supreme Court is a lawmaking institution but one that is constrained by widely shared understandings of the judicial role in ways that legislative lawmakers are not.