How do we remember 9/11? What should history teach?

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It's been 15 years since the brilliant September morning that upended American life and set George W. Bush on the road to war in Afghanistan and Iraq. This election year, millions of first-time voters will have little or no memory of an event traumatized the country and changed so much about the world.

View across the south pool of the National September 11 Memorial in New York City
towards the adjacent National September 11 Memorial Museum.
Photo by Norman B

How do we remember the victims and first responders who gave their lives at the World Trade Center, the Pentagon and a field in Shanksville, Pennsylvania?  And the unintended victims: Muslim-Americans who live under the shadow of 9/11, in a presidential campaign when anti-Muslim feeling has once again come to the fore?