There are any number of lessons to be taken from the events of Sept. 11, 2001: the sacrifices of the first responders, the stories of those who were killed, the emergence of terrorism as a critical threat to the United States.
"Americans United After 9/11. When Did We Rip Back Apart?" is from the September 11, 2017 Politics section of The Washington Post. It was written by Philip Bump and narrated by Sam Scholl.