“Internet gambling is on a roll in the US market after years in the shadows. New Jersey kicks off its online wagering November 26, becoming the most populous state to do so after Nevada and Delaware. Other states have become active since 2011, when the federal government signaled it would not block most forms of Internet wagering. California, Illinois and Pennsylvania are considering such moves. Using geolocation technology, the systems require that gamblers be located within the state. Reciprocal agreements could allow gamblers to cross state lines. Morgan Stanley estimated legal US online gambling revenues would reach $670 million in 2014, increasing to $9.3 billion in 2020.”
http://phys.org/news/2013-11-online-gambling-gains-momentum.html