Three new free-trade agreements are a blast of fresh air for America's oxygen-starved economy. And they're a refreshing sign that bipartisanship is still possible in Washington. The deals with South Korea, Colombia and Panama are expected to increase U.S. exports by $13 billion a year, supporting tens of thousands of jobs. Throughout history, trade has driven prosperity. That's why, from the earliest days of civilization, people have trekked across deserts and gone to sea in tiny vessels.