"Although most Americans believed in Manifest Destiny, few could agree on exactly which land the U.S was supposed to govern." these words written by Charles W. Carey Jr. shows me how unjustified United States was when it went to war with Mexico. Another thing that the quotes tells us is that even though most people believed in manifest destiny, only some could agree on the land that United States was supposed to govern, and this belief was how the Mexican-American War happened which was a war that United States wasn't justified in going to. The Mexican- American War(1846-1848) also known as the U.S Invasion in Mexico was an armed conflict between the United States and Mexico. The main reason the war happened was because in 1845 when the United States annexed Texas, which Mexico considered their land even though Texas was independent from Mexico in 1836 after the Texas Revolution. But in my opinion, to the Question "Was the United States Justified in Going to War with Mexico?", the United States was not justified in going to war with Mexico. Although there are many reasons why the U.S. was not justified in going to war with Mexico, the three main reasons main reasons are because: first, John O'Sullivan's belief in Manifest Destiny. Second reason is because James Polk provoked the Mexico tof ight and lastly, American in Texas were not following the Mexican rule.
To begin with, the first reason the United States was not justified in going to war with Mexico was because of John O'Sullivan. John O'Sullivan was a journalist who believed in Manifest Destiny, and because he was a journalist, he could talk about Manifest Destiny and how we are supposed to expand the U.S. in newspaper which changed most of the Americans point of view. Here is one evidence for my claim. According to Document A, in the text when it says "Other nations have undertaken hostile interference against us.
