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How many tribes in how many states operated casino or bingo businesses by 2000?

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Map of the United States showing states that allow Indian casino gambling operations highlighted in blue, while states without such operations are shown in beige. Most western, midwestern, and northeastern states permit Indian gaming, while several southern and southeastern states do not. — Indian gaming U.S. states that allow Indian gaming.

By the year 2000, more than 150 Native American tribes across 24 states were operating casino or bingo businesses on their reservations.1