Throughout its history, the United States has been marked by significant events that have left indelible scars on its national consciousness. While the nation is often celebrated for its triumphs, moments of tragedy and crisis have profoundly shaped its narrative, bringing loss, shock, and transformation. These pivotal incidents have not only altered the course of history but have also left lasting scars on the American psyche. This exploration delves into fifteen such days that stand as somber reminders of the nation’s past.