Twenty-three years ago tragedy struck the nation, leaving every U.S citizen in shock and disbelief, marking one of the darkest days in U.S. history. On September 11, 2001, a series of coordinated terrorist attacks claimed the lives of nearly 3,000 people and forever altered the course of history. The ripple effects from that moment is still felt today, from heightened national security measures to the collective memory of a grieving nation.