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yangqi 刚刚在网上查了一下
http://www.powerball.com/pb_contact.aspCAN I BUY POWERBALL TICKETS THROUGH THE INTERNET?
No. A lottery can also legally sell tickets on the Internet, but only to persons within its own state. No one can sell lottery tickets by mail or over the Internet across state lines or the U.S.
不能在网上买彩票，跨州卖彩票，邮寄卖彩票都属于违法。所以更不要说跨国买了，就算你中大奖了自然也是作废。也许一些小奖可能睁一只眼闭一只眼。
CAN A NON-RESIDENT WIN POWERBALL?
Some states do have rules that seem to imply that a winner must produce evidence of citizenship or a federal SSN
部分州限制非居民身份，和非美国籍或拥有SSN社保号限制领奖。
http://news.newamericamedia.org/news/view_article.html?article_id=95803adae2d5b45f5881b04e5097fd7b看到一个法律案例，一个墨西哥非法劳工被纽约州拒绝发奖。一个俄罗斯游客在New Jersey因持旅游签证并无SSN号被拒绝发奖。