KT McFarland: 20 years after 9/11 it's like we've been gut-punched again. Still, don't count Americans out

Twenty years after 9/11, those iconic pictures of the Towers burning, and then collapsing, still have the power to terrify many of us. But what happened in the days and months and years that followed September 11th, 2001 has came to define us.
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