Ten years later there can be little question that the Sept. 11, 2001, terrorist attacks have changed much in the United States -- everything from decisions on foreign policy to government spending priorities to airport security. And while those attacks…

A girl places flowers at the Pentagon Memorial at its dedication on Sept. 11, 2008. Photo by Tom LeGro/PBS NewsHour All this week, we've been exploring where America stands 10 years after 9/11, from national security to…