conflict between Mexican and U.S. forces was that of Manifest Destiny. Incorporate within the concept of Manifest Destiny was the idea that Americans and American had a God-given right to push the borders of the nation from sea to shining sea. President Polk took office in 1845, and by this time the concept of Manifest Destiny had taken firm root in the American mentality. With more Americans moving west and a president who was a strong advocate of expansion, the concept of Manifest Destiny continued to grow in popularity. Americans overlooked the fact that there were alre
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