Twenty-five years ago, Neil Howe and the late William Strauss dazzled the world with a provocative new theory of American history. They’d uncovered a distinct pattern: modern history moves in cycles, each one lasting roughly eighty to one hundred years, with each cycle composed of four eras—or “turnings”—that always arrive in the same order and each last about twenty years. The fourth turning—was always the most perilous, a period of civic upheaval and national mobilization. Neil Howe has returned with an extraordinary new prediction. What we see all around us—the polarization, the growing threat of civil conflict and global war—will culminate by the early 2030s in a climax that poses great danger and yet also holds great promise. Every generation alive today will play a vital role in determining how this crisis is resolved, for good or ill.