Answer:
The military stopped the Dakota uprising because Dakota warriors killed 400 white settlers in Minnesota.
Step-by-step explanation:
The Dakota Uprising was an armed conflict between the United States and the Dakota tribe (also known as Santee-Sioux). The clashes took place in the state of Minnesota and costed more than 400 civilians lives. On the side of the Santee died about 100 people and, after the conflict, 38 more were hanged in the largest mass execution of US history. The uprising marked the beginning of a long series of battles between the United States and the Sioux Indians.