There was a National ban on sports Gambling in the USA from 1992 to 2018 under the Professional and Amateur Sports Protection Act (PASPA).

The 1992 law granted resistance to four states that had previously allowed sports gambling inside their borders. Those countries are Nevada, Delaware, Oregon, and Montana.
The condition of New Jersey challenged the legality of PASPA. The Supreme Court heard oral arguments in late 2017. On May 14, SCOTUS issued a decision reversing the ban, striking down PASPA in full by a vote of 6-3. Thanks to the conclusion, These countries now offer legal sports betting:
Delaware — Launched June 5, 2018
Sports Betting in New Jersey — Launched June 14, 2018
Mississippi — Launched Aug. 1, 2018
West Virginia — Launched Aug. 30, 2018
Sports Betting at Pennsylvania — Launched Nov. 16, 2018
Rhode Island — Launched Nov. 26, 2018
Arkansas — Launched July 1, 2019
Countries that have passed sports gambling legislation, but have not launched it yet:
Tennessee — April 30, 2019
Montana — May 3, 2019
Indiana — May 8, 2019 (get a full FAQ here)
Iowa — May 13, 2019
Illinois — June 2, 2019
Delaware was actually the very first into the expanded marketplace. The state used the current sports betting law on its publications, established single-game wagering regulations, and started taking stakes on June 5, 2018.
A property in New Mexico also started reserving legal wagers on Oct. 16. Santa Ana Star Casino & Hotel signed a deal with USBookmaking in early October to establish a sportsbook.
Why is New Mexico an intriguing situation is that Santa Ana is a tribal home. Mississippi was the first state to launch tribal sports gambling, but it was done in tandem with a state legislation. In Santa Ana’s case, sports betting is still illegal everywhere in the country, but the tribe can take bets on its own land.
The Pueblo of Santa Ana Gambling Regulatory Commission regulates the casino wagers.

Read more: centralsportsnews.com