Contrary to popular belief, gambling is not illegal under US law. In fact, certain types of gambling (horse racing) are explicitly protected by federal law, an

Contrary to popular belief, gambling is not illegal under US law. In fact, certain types of gambling (horse racing) are explicitly protected by federal law, and generally gambling laws are up to the states (online gambling of all kinds is perfectly legal in NV and NJ). Betting online on horse races is explicitly legal in 30+ states, and not explicitly illegal in several more. Certain jurisdictions disallow online betting on horse races if you live within some radius of a local horse track. [Edit: to clarify, some forms of gambling are explicitly disallowed across state lines, but that ban does not have any impact within state lines]