The party that wins the right to draw the legislative maps of the 2020s will have enormous power to shape future Congresses and state legislatures—to determine, for example, whether districts are drawn in such a way that Republicans need only worry about winning conservative votes and Democrats liberal ones, or in a way that might push candidates toward the center; and whether districts comply with the Voting Rights Act, in a decade when much demographic change is expected, enough to perhaps turn the crucial state of Texas at least purple, if not blue. Much is at stake.