The World Trade Center in New York was attacked and destroyed, with many casualties. The Pentagon was also targeted, but the attack failed.
George Bush declared the <em>War On Terror</em>, putting us at war with every country in the Middle East, costing tens of thousands of lives and getting us nowhere (also we're <em>still</em> fighting, though now it's focused on ISIS too).
Airfields more than tripled their security, with the United States becoming one of the most heavily regulated airport places in the world
