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Amid the election-year debate over the future of health care in America, the PBS NewsHour explores the state of the U.S. health care system and how it compares to others worldwide. United States Houston, Texas, represents the two poles of health care in America -- a hub of medical innovation and cutting-edge clinical care, alongside millions of uninsured Americans suffering from treatable, preventable diseases. WATCH: Is U.S. health care the best or ‘least effective’ system