Final answer:
The two battles fought between the Great Plains Indians and the U.S. Army were the Battle of Little Bighorn and the Wounded Knee Massacre.
Step-by-step explanation:
There were two major battles fought between the Great Plains Indians and the U.S. Army.
- The Battle of Little Bighorn: In 1876, the Lakota Sioux and their allies, led by Sitting Bull, defeated the U.S. Army's Seventh Cavalry, commanded by Colonel George Custer.
- This battle resulted in the death of Custer and 262 of his men, making it the single greatest loss of U.S. troops to a Native American force during westward expansion.
- The Wounded Knee Massacre: In 1890, an uprising triggered by the Ghost Dance ritual led to an armed conflict between the U.S. Army and the Sioux people at Wounded Knee, South Dakota.
- The U.S. Army's response resulted in the deaths of approximately 150 Sioux men, women, and children.