BetOnline – Best gambling site in the USīetOnline has been in the US for over a decade and provides all popular gambling products including an outstanding sportsbook, top poker software, comprehensive racebook, and huge online casino. These are all licensed offshore operators that offer better games, stronger odds, and bigger bonuses than local regulated gambling apps. Top 5 Gambling Sites Reviewedīelow are short reviews of the top five best offshore gambling sites in the US. To learn more about how we rank the legal gambling sites featured on our pages, and to get a detailed assessment of our review criteria and process, please click the link.