Soccer-'Great American Sleepover' softens US image abroad, but World Cup charm campaign hit some bumps
By Amy Tennery NEW YORK, July 20 (Reuters) - A supersized World Cup tournament and its dizzying array of feel-good social media fodder gave the U.S. image a much-needed boost globally, though concerns over high-level interference and visa difficulties for some fans overshadowed the action on the 
