The U.S. will move “very quickly” to forge the Americas Partnership for Economic Prosperity along with 11 other countries that represent 90 percent of Western Hemisphere GDP, a senior administration official said on Thursday, offering the most substantive outline of the emerging deal ahead of a public unveiling. Initial APEP partner countries will include Barbados, Canada, Chile, Colombia, Costa Rica, the Dominican Republic, Ecuador, Mexico, Panama, Peru, Uruguay and the U.S., a group of countries that includes two-thirds of the...