The Mexican-American war was a conflict between the United States and Mexico that began in 1846 and ended in 1848. The war was a result of a dispute over the U.S. annexation of Texas and the Mexican government's refusal to recognize the Rio Grande as the southern boundary of the United States. The war resulted in a U.S. victory and the signing of the treaty of Guadalupe Hidalgo, which allowed the U.S. to acquire large swaths of Mexican territory, including the modern-day state of California, New Mexico, Arizona, Nevada, Utah, and parts of Colorado, Wyoming, and Oklahoma. Despite the U.S. victory, the war was not justified and was a violation of Mexico's sovereignty.
The first reason why the Mexican-American war was not justified is that it was based on pretenses. The U.S. declared war on Mexico under the pretense that Mexico forces had crossed the Rio Grande and attacked a U.S. military outpost. However, this was later revealed to be false, and the U.S. used this pretense as an excuse to declare war on Mexico.
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had refused to recognize Mexico's claim to the disputed territory. This lack of diplomacy made it impossible for the two countries to agree and instead led to war.
The third reason why the Mexican-American war was not justified is that it was a violation of the Monroe Doctrine. The Monroe Doctrine was a policy established by President James Monroe in 1823 that stated that the U.S. would not interfere in the affairs of other countries in the Western Hemisphere. The war was a clear violation of this policy as the U.S. was intervening in the affairs of Mexico without