Native American Tribes have flipped their fortunes by building casinos on their land, but that is under threat from the new players in the market - the online sports betting companies. Dr Heather Wardle meets Greg Sarris, Chairman of the Federated Indians of Graton Rancheria in Northern California, who shows her why his tribe’s casino is a lifeline to the local community, and how online betting on smartphones is the new threat to his tribe’s survival.

(Photo: USA Graton Casino, owned by the Federated Indians of Graton Rancheria)