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American expansion into California was fueled by the belief in Manifest Destiny, which held that the U.S. was destined to expand across the continent. This expansionist sentiment heightened tensions with Mexico, as the U.S. annexed Texas and sought to acquire California and other territories. The situation escalated when the U.S. sent troops into disputed areas, leading to skirmishes that were used as a pretext for declaring war on Mexico in 1846. Ultimately, this conflict was driven by both territorial ambitions and deep-seated nationalistic ideals.

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