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What share of legal gambling receipts in the United States came from Indian gaming by 2005?

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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 2005, Indian gaming accounted for approximately 25 percent of all legal gambling receipts in the United States.1