Why are there so few Americans caught up in the Panama Papers leak? Because the U.S. has an 'onshore haven industry that is just as secretive' with people forming shell companies in Wyoming, Delaware and Nevada
http://www.dailymail.co.uk/news/article-3526077/Why-Americans-caught-Panama-Papers-U-S-onshore-haven-industry-just-secretive-people-forming-shell-companies-Wyoming-Delaware-Nevada.html