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Lessons and failures from America's response to 9/11 terrorist attacks

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Today marks the 20th anniversary of the 9/11 terrorist attacks. Has the U.S. learned any lessons since then about its response to these attacks? Carlos Lozada, Book Critic for The Washington Post, joined American Voices with Alicia Menendez to discuss what he has taken away after reading books released over the past two decades related to 9/11.