United States under Thomas Jefferson acquires 828,000 square miles of land formerly owned by France.
Settlers begin moving along the Oregon Trail and through Sioux territory in the Platte River Valley. This decades marks the start of frequent contact between Indians and whites.
Due to violence between tribes and towards settlers, US soldiers take presence in the Platte River Valley.
First military base established on Lakota Land.
Government's first attempt to place well defined boundaries on American Indians.
Policy signed into law by President Ulysses Grant--- assigned several Christian denominations to each Indian reservation.
Law prohibits all American Indian ceremonial dances.
An Indian prophet named Wovoka, begins a new Ghost Dance Movement which is widespread amongst Native Americans.
Wounded Knee Massacre is a violent attack on the Lakota Sioux that kills over 300 men, women, and children.