After the civil war, railroads connected the country on a national scale, boosting the economy and leading to mass production, mass consumption, and encouraging entrepreneurs.
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The treaty established the boundary of U.S. territory and claims through the Rocky Mountains and west to the Pacific Ocean, in exchange for the U.S. paying residents' claims against the Spanish government up to a total of $5,000,000 and relinquishing the U.S. claims on parts of Spanish Texas west of the Sabine River
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Not only was the Soviet Union communist, they were totalitarian, meaning all the power was with the rulers. The United States was capitalist which meant that people could own land and businesses and compete for themselves. This led to a stark contrast between poor and rich.
<em>I hope this helped out! <3</em>