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The Mexican army attacked them. The main cause of the war was the westward expansion of the United States. All through the 19th century Americans believed it was their right to expand westward. At the time they believed they could conquer the people already living on the land and take it for the United States.
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American imperialism helped to bring new cultures toward modern educational standards. Cultures were able to learn global languages, allowing for easier communication between cultures. Being able to read and write allowed individuals to begin creating new goals for their families.
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private ownership and free markets
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