U.S. Army massacres Sioux Indians at Wounded Knee

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Throughout 1890, the U.S. government worried about the increasing influence at Pine Ridge of the Ghost Dance spiritual movement, which taught that Native Americans had been defeated and confined to reservations because they had angered the gods by abandoning their traditional customs. Many Sioux believed that if they practiced the Ghost Dance and rejected the ways of the white man, the gods would create the world anew and destroy all non-believers, including non-Indians. On December 15, 1890, reservation police tried to arrest Sitting Bull, the famous Sioux leader, who they mistakenly believed was a Ghost Dancer, and killed him in the process, increasing the tensions at Pine Ridge.