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A U.S. flag is unfurled at sunrise on Tuesday, Sept. 11, 2018, at the Pentagon on the anniversary of the Sept. 11, 2001, terrorist attacks.

A U.S. flag is unfurled at sunrise on Tuesday, Sept. 11, 2018, at the Pentagon on the 17th anniversary of the Sept. 11, 2001, terrorist attacks. (AP Photo)

U.S. Department of State

The Lessons of 1989: Freedom and Our Future