>> i'm headed to oklahoma to learn more about the osage. how they became so rich. >> the rush was on. >> and who wanted them erased from their towns. >> she was 21 years old. >> and ultimately from american history. >> america was built on the graves of indians. they didn't care if we died. they didn't care if our children died. >> it wasn't okay then. it's not okay now. murder is murder . ♪ ♪