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Texas had fought a war with Mexico and won. They declared Texas to be an independent country. Texas later applied to become part of the United States. At first the United States said no because they knew Mexico would protest. But a wave of feelings called "Manifest Destiny" made Americans feel that American would get better if it grew bigger. James Knox Polk campaigned to make Texas part of the United States but it was done before Polk became president. Mexico did protest and the United States invaded Mexico. In addition to Texas, America took land for Arizona, California, and Nex Mexico.

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7y ago

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