The conflict was known as the Mexican-American War. Variously referred to as The Mexican War or Mexican Independence. Because of the stealing of land and the growth of slavery under President James K. Polk, the United States' involvement in the war with Mexico was unwarranted.
Three key factors made the United States' decision to invade Mexico justified: Americans were slaughtered, Texas had already been acquired, and Manifest Destiny permits it. Texas proclaimed its independence in 1836.
No, it was simply a desire for American growth. President Polk made a hypocritical choice to declare war on Mexico because it was violating boundaries and killing people needlessly. Texans who declared their independence from Mexico in 1835 founded a nation.
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