Why Was The Mexican American War Justified

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The main reasons why the United States entered the Mexican-American war were Manifest destiny, which was the belief that the expansion of the U.S. throughout the American continents was both justified and expected, western expansion, economics, and slavery. American citizens in the south wished to gain more slave states in order to increase their political power. The United States annexation of Texas and the American’s desire for California and other Mexican territories were also main reasons.
I don’t think that the reasons for the United States was justified because the state was a violation of the 1828 boarder treaty, which had acknowledged Mexico’s sovereignty over that territory, even though it such acts were a violation of the important

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