How did the expansion of railroads affect American Indians in the West?

The American Indians had to give up their way of life.

Explanation:

As Americans began to move west and set up the Transcontinental Railroad, they kept encountering American Indians. Due to the nature of the railroads, the American Indians had to give up their land for civilization's expansion and for the railroads to be constructed. Also, the amount of buffalos drastically declined causing American Indians to lose a lot of their food supply.

A

Explanation:

They were displaced from their tribal lands.

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