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D, demonstrating American strength to the world.
It wasn't so much the Civil War, but the expansion of the United States that led to the Civil War, that brought about the Second Industrial Revolution, since this expansion brought a need for massive amounts of railroad materials.
Answer: sorry I can't see it clearly
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A state of political hostility between countries characterized by threats, propaganda, and other measures short of open warfare.
the state of political hostility that existed between the Soviet bloc countries and the US-led Western powers from 1945 to 1990.