Representatives of U.S. agribusiness, the farming lobby and related industries opened a three-day conference in Cuba on Thursday aimed at increasing sales and cooperation with a country that the administration of U.S. President Donald Trump has repeatedly lambasted and promised to tighten sanctions on.The U.S. Agricultural Coalition for Cuba, which seeks increased trade with Cuba and the lifting of the trade embargo, is sponsoring the event.U.S. farmers and agribusinesses have sold $5.7 billion in food to the Communist-run Caribbean island since 2000, when an amendment to the trade embargo allowed agricultural sales for cash, according to the U.S.-Cuba Trade and Economic Council, a New York-based organization that monitors the bilateral trade.