As white settlers and trains led to the decimation of the buffalo, whose way of life was threatened?

The native Americans were highly threatened by the diseases that were brought to the land by the settlers. That's because most of those diseases did not exist in the Americas. Therefore, the native Americans did not have any sort of protection to things like the common cold.

Explanation:

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the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.