WORLD HISTORY

Detailed explanation-1: -From top, left to right: The Twin Towers burning. Rescue workers at Ground Zero. Collapsed section of the Pentagon. Fragment of the Flight 93 fuselage. 9/11 Memorial south reflecting pool and One World Trade Center.

Detailed explanation-2: -American Airlines flight 11 and United Airlines flight 175 were flown into the World Trade Center’s north and south towers, respectively, and American Airlines flight 77 hit the Pentagon. United Airlines flight 93 crashed in a field near Shanksville, Pennsylvania, after passengers attempted to overpower the hijackers.