（初めに右欄で英語を１つ選び、続いて選択肢から１つを選んでください。やり直すときは、英語を選び直すことから始めてください。右の［単語帳］を参考にすることもできます。）The Indians of the plains depended on the buffalo for almost everything they needed. Many of them were fierce fighters. The plains Indians did not want white men crossing their hunting lands. They often tried to destroy the wagon trains carrying settlers to California and Oregon.
The United States army was given the job of keeping peace. Soldiers were sent to build roads and forts in the western plains. They tried to protect the wagon trains from Indian attacks. They tried to keep white settlers from invading Indian lands. There were many fights between the soldiers and the plains Indians. The soldiers had more powerful weapons. They usually won.
Some plains Indians tried to live peacefully with the white men. One such group was part of the Sioux tribe, called Santee Sioux. It was the largest and most powerful group in the west.
The Santee Sioux lived along the northeastern edge of the Great Plains in what is now the state of Minnesota. They signed treaties with the government giving up ninety percent of their land. The Santee agreed to live in a small area. In exchange, the United States agreed to make yearly payments to the tribe. This made it possible for the Indians to buy food and other things from white traders.
Trouble started, however, in the summer of eighteen sixty-two. The government was late giving the Indians their yearly payment. As a result, the Indians lacked the money to buy food. The white traders refused to give the Indians credit to buy food. One trader said: "If they are hungry, let them eat grass."
The Indians were hungry. Soon, their hunger turned to anger. Finally, the local Indian chief called his men together. He gave the orders for war.
Early the next morning, the tribe attacked the trading stores. Most of the traders were killed, including the man who had insulted the Indians. He was found with his mouth filled with grass.
The governor of Minnesota sent a force of state soldiers to stop the Indian revolt. The soldiers had artillery. They killed several hundred Indians in battle. They hanged several others. Soon, the revolt was over.
Trouble came next to parts of Colorado and Wyoming. This is where the Sioux Indians and the Cheyenne Indians lived. The chief of the Lakota Sioux tribe was named Red Cloud. The Indians fought bitterly to keep white men out of their hunting grounds. After two years of fighting, with many deaths on both sides, the government decided the struggle was too costly. It asked for peace.