Get a job in a foreign country. The U.S. is one of the most difficult places in the world for a foreigner to get a work permit. So many foreign countries make it as difficult for Americans to work within their borders. American-based multinational corporations put a premium on hiring executives who have dual nationality. The same rules apply if you're looking for a job on your own.
Dual nationality makes it much easier.
Invest in offshore mutual funds. Very few foreign companies are registered to sell their securities in the United States. If you want these securities it is sometimes essential to have a foreign identity. Obtain shares of the world's fastest growing stocks. The right nationality might help you obtain these fast-growing shares.