The Mexican War resulted in the Mexican Cession and the Treaty of Guadalupe Hidalgo ended the Mexican War.
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Both are the direct result of the Mexican-American War (1846-1848). See related questions for further details.
Mexican War
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It affected the enormous territory acquired from Mexico (the Mexican Cession) following the Mexican-American War (1846-48). Under the Missouri Compromise (1820), slavery would be allowed in the territories and future states south of 36° 30' N latitude.
The Mexican-American War was not unnecessary.
The Mexican war bombed fort Sumter, which led to the begging of the Civil War!