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Historic: Watch the end of America's longest war

11:19

The U.S. has fully withdrawn from Afghanistan, formally ending a nearly 20-year war. Over that time, 2,461 American troops died in service to their country. MSNBC's Ari Melber is joined by former DNC chair Dr. Howard Dean, The Nation's Katrina vanden Heuvel and Iraq War veteran Jon Soltz to discuss.