Today we remember the awful things done to the United States by a group of young Arab men on September 11, 2001. The crimes were done in the name of Al Qaeda acting on behalf of Muslims struggling against the Great Satan (aka, the United States).
The hijacking and crashing of four planes, three of them into high value targets, caused over 3000 deaths of innocent people going about their lawful pursuits. They were not the first American deaths in the Long War, but they were certainly the largest group yet to die in one day on U.S. soil. We owe it to their memories never to forget what was done to them, or by whom.