In the USA gambling is intended to be a recreation in most cases. Many people enjoy gambling in a healthy way. For some though gambling can be a problem. For this and other reasons some states have made gambling illegal. It preserves a way of life that people of that state want. In other states some forms of gambling, betting on horse races for example, is legal. In those same states where horse racing is legal though the games that casinos typically house may be illegal. Take care that you are familiar with the laws concerning the specific type of gambling that you intend to do.
Another factor to consider when you are preparing to gamble in the USA is to consider the location of the company that operates the gambling website. When you engage in a transaction, etc. online you may be dealing with a company that is actually in another country. Verify that the casino you are playing in does not have special considerations for people that play while residing in the USA. Gambling in the USA is fun for many people and when you give some fore-thought to what you are doing it can be fun for you too. If you are in The United States of America consider gambling in a casino that is housed in the USA and possibly even in the state that you are residing in. You may find a new game you have never tried. Also when betting consider using a local, registered bookie and observe all laws regarding your location and the method you use to place the bet. Have fun and be lega, it's a safe bet.