National flags representing Canada, Mexico, and the U.S. are lit by stage lights at the North American Free Trade Agreement, NAFTA, renegotiations, in Mexico City, on September 5, 2017. Canada and Mexico are prepared to engage the United States on one of its most contentious demands for NAFTA, in an early indication of how proposals currently deemed non-starters could in theory be redesigned into something all three countries can live with. THE CANADIAN PRESS/AP, Marco Ugarte
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