A welcome bonus is a bonus that a casino offers its players once they join their site. It's a way to appreciate new customers and encourage them to play. However, any winnings from the welcome bonus may have to be used to make other bets before any withdrawals can be made.
The United States is the land of freedom and opportunities. Besides that, it's also where one can easily play casino games by joining many online mobile casinos that cater to US residents. If one doesn't have the chance to go to Las Vegas, online gambling allows them to enjoy their favorite games without leaving their home.