What is the legality of online gambling sites?

Online Poker is legal in several countries including the United Kingdom and several nations around the Caribbean Sea. There has been much legal opposition to online poker in the United States, making operating such a site a felony-level crime. However a recent Federal court ruling that poker is a game of skill, not chance, has opened the door to legalizing online poker in some states. Just six days ago, May 1, 2013, Nevada became the first state where people at least 21 years old could legally play poker online for money.