Oklahoma City bombing

FILE - In this Sept. 11, 2020, file photo, mourners place flowers in the name cut-out of Kyung Hee (Casey) Cho at the National September 11 Memorial and Museum in New York. A U.S. Army soldier was arrested Tuesday, Jan. 19, 2021, in Georgia on terrorism charges after he spoke online about plots to blow up New York City's 9/11 Memorial and other landmarks and attack U.S. soldiers in the Middle East, authorities said. (AP Photo/John Minchillo, File)

A Tuesday like no other: Did it really change everything?

9/11 more than anything accelerated changes that had been in motion for some time, even decades.

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