1868 मायथायाव मोनसे गोरोबथा गनायथि दोंमोन , नाथाय आंगो आमेरिकान राज्यो न्लेक हाजोफोराव सना अबिसकार खालामनायनि उनाव बे गोरोबयाखौ 1876 मायथायाव सिफायदोंमोन ।
A treaty was signed in 1868 but whites broke it in 1876 after gold was discovered on Native American land in the Black Hills .