FLAGSTAFF, Ariz. (AP) — American Indian tribes are welcoming an opportunity to offer sports betting in potentially hundreds of casinos across the country after the U.S. Supreme Court cleared the way for states to legalize it.

Tribal casinos generate more than $31 billion a year in gross revenue. While adding sports books isn't expected to boost that number significantly, tribes say it's another source to deliver services to tribal members.

Many tribes give a share of casino profits to states in exchange for exclusive rights to conduct gambling operations. In Arizona, the state's share was about $100 million last year.

Some tribes believe agreements with states already give them the right to control sports betting, while others will work out the details through negotiations in compacts that vary in wording state by state.

Nearly 240 tribes operate casinos in more than half of U.S. states under the federal Indian Gaming Regulatory Act or as commercial ventures. Some only have games like bingo or pull tabs that don't need authorization from states. The majority of the roughly 475 tribal casinos have those games and others like slot machines, blackjack and other table games, according to the National Indian Gaming Commission. Sports wagering would fall in the latter category, the commission said.

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