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The Transcontinental Railroad fundamentally changed the American West. As the United States pushed across North America, railroads connected and populated the growing nation. Railroads also sparked social, economic, environmental, and political change.
Answer:
The change in breastplates and helmets contribute to decline of the Roman Empire by weakening the the military. It weaken them because the removal of it promote laziness and negligence of training and the such. It also removes the protection against ranged weapons which caused many casualties.
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Answer: law of self-interest and the law of competition
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Answer:
Slaves mightve entered the union army or run away from working for the south to produce for the souths war efforts. Dont remember much history but i think that was the vague idea.
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