Tuesday, 11 September, 2001, began as a normal day. In both New York City and Washington, DC, the morning weather was sunny and clear. Students went to school, workers went to the office, and about 17,000 people commuted to their jobs at the World Trade Center.
By the end of the day, the world had changed. The United States had suffered its worst-ever terrorist attack, nearly 3,000 people were dead, and history had suddenly veered onto a vastly different and more violent trajectory.
