Is it legal to gamble in the US?

Answer 1

Any number of states have race tracks, off-track-betting facilities, gambling casinos (especially on the property of the Native American Tribal Reservations), state lotteries, etc, etc.

Gambling in the US is mainly regulated by state, rather than Federal, law. So it matters very much where you live. You may need to travel to a different state, or to a particular location within your own state (Missouri, for example, allows "Riverboat gambling". Legal casinos may operate aboard an "excursion boat." The legal definition includes permanently docked "boats" which are not readily recognizable as such, such as Sam's Town near Kansas City, which floated in what was essentially a very large, shallow, swimming pool and was reachable without noticeably crossing water. It was, to be fair, near the river.)

Answer 2

Yes. Gambling in the U.S. is legal. However, each state has its own gambling laws. Some individual states like Utah do not allow any gambling at all.

The state of Nev. allows gambling through out the state and many states allow casinos on Native American reservations because they are considered federal property and not state. Some southern states have river boat gambling.