On this day, July 27, in 1953, the United Nations and North Korea signed a ceasefire, bringing an end to three years of fighting on the Korean Peninsula that killed more than 36,000 US soldiers and an estimated 2 million Korean civilians. But a formal peace agreement was never signed. The World's host Marco Werman speaks with David Kang, professor of international relations at the University of Southern California, about the legacy of this unfinished conflict and prospects for peace between North and South Korea.