Why was the Sioux Ghost Dance considered to be a form of rebellion-Why were the Sioux so anxious to believe in the host Dance?

Part 1:

After watching the Video: “The Tragedy of Wounded Knee (The Ghost Dance)” (https://www.dailymotion.com/video/x2s12ty ) answer the following questions:

Why was the Sioux Ghost Dance considered to be a form of rebellion?
Why were the Sioux so anxious to believe in the host Dance?

Part 2:

Compose a descriptive paragraph on what life would be like on an Indian reservation in the late 1800’s.