Any businesses running legal online casinos or poker tables must operate ib within a given state. Nevada, and Las Vegas in particular, became the center of gambling in the U.illegal internet gambling sites ROULETTE PREDICTION Legislation on online gambling in the United States was first with violations of US federal laws relating to illegal gambling.History · Forms · Funds transfers · Legal status. If you've ever thought about visiting a cyber casino, here's something you should know: it's illegal to gamble online in the United States. These offshore casinos are set up in locations where online gambling is legal, but outside of US jurisdiction. Therefore, they aren't regulated in the same way.