Answer:
The Transcontinental Railroad dramatically altered ecosystems. For instance, it brought thousands of hunters who killed the bison Native people relied on. The Cheyenne experience was different. The railroad disrupted intertribal trade on the Plains, and thereby broke a core aspect of Cheyenne economic life
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The answer is
A. By leading settlers across the Appalachians.
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1. exploitation of foreign regions for natural resources
2. promotion of white superiority
3. the spread of English language in South Asia (although European Imperialism was mentioned in the question and not British)
