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

The 1992 law granted immunity to four states that had previously allowed sports betting inside their boundaries. Those countries are Nevada, Delaware, Oregon, and Montana.
The condition of New Jersey contested the legality of PASPA. The Supreme Court heard oral arguments in late 2017. On May 14, SCOTUS issued a decision reversing the ban, hitting down PASPA in total by a vote of 6-3. Thanks to the conclusion, the following states now offer legal sports gambling:
Delaware — Launched June 5, 2018
Sports Betting at New Jersey — Launched June 14, 2018
Mississippi — Launched Aug. 1, 2018
West Virginia — Launched Aug. 30, 2018
Sports Betting in Pennsylvania — Launched Nov. 16, 2018
Rhode Island — Launched Nov. 26, 2018
Arkansas — Launched July 1, 2019
Countries who have passed sports gambling legislation, but have not found 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 really the first into the expanded marketplace. The nation used the current sports betting law on its books, established single-game wagering regulations, and began taking bets on June 5, 2018.
A property in New Mexico also began reserving legal wagers on Oct. 16. Santa Ana Star Casino & Hotel signed a deal with USBookmaking in early October to launch a sportsbook.
What makes New Mexico an interesting situation is that Santa Ana is a tribal property. Mississippi was the first state to start tribal sports gambling, but it had been done in conjunction with a state law. In Santa Ana’s case, sports gambling remains illegal everywhere in the state, but the tribe can take bets on its land.
The Pueblo of Santa Ana Gaming Regulatory Commission regulates the casino wagers.

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