FLAGSTAFF, Ariz. (AP) — American Indian tribes are welcoming the opportunity to offer sports betting in potentially hundreds of casinos across the country.

The U.S. Supreme Court this week 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 much-needed services to tribal members.

Many tribes give a share of casino profits to states in exchange for exclusive rights to conduct gambling operations. Arizona, for example, gets about $100 million a year.

Sports books have been the topic of tribal gambling conferences and panels in the months leading up to the U.S. Supreme Court decision.