There was a National ban on sports betting in the United States from 1992 to 2018 Beneath the Professional and Amateur Sports Protection Act (PASPA).
The 1992 law granted immunity to four countries that had previously allowed sports gambling inside their boundaries. Those countries are Nevada, Delaware, Oregon, and Montana.
The state 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 total by a vote of 6-3. Due to the conclusion, the following countries now offer legal sports gambling:
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 betting 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 actually the first into the enlarged market. The state used the existing sports gambling law on its books, based single-game wagering regulations, and started taking stakes on June 5, 2018.
A property in New Mexico also started booking legal wagers on Oct. 16. Santa Ana Star Casino & Hotel signed a deal with USBookmaking in early October to establish a sportsbook.
What makes New Mexico an intriguing case is that Santa Ana is a tribal home. Mississippi was the first state to start tribal sports gambling, but it had been performed in tandem with a state legislation. In Santa Ana’s case, sports betting is still illegal elsewhere in the state, but the tribe can take stakes on its land.
The Pueblo of Santa Ana Gambling Regulatory Commission regulates the casino wagers.