>> but it didn't end there. >> the federal government was like, we need to break up their communal land holdings so that they are without a tribe. >> the osage had always shared their land. in 1906, they were forced to split their territory into private lots to weaken the unity of the tribe. but they held on to one seemingly small concession, collective ownership of what lay beneath the ground. not only did you own the land, the surface land, but you also owned -- >> the subsurface. that would become a game-changer two years later. >> ten years after they brokered the deal for the mineral rights, the osage revealed they were sitting on a gold mine. some of the largest oil deposits in north america. in the 1920s, these oil wells littered this landscape. they were everywhere as far as the eye can see, and that's what