The united states believed the border was between the Niteces river(Roden,315). Mexico thought the border was between the Rio Grande(Roden,315). For Mexicans the americans crossed the territory and americans thought they were on their side. . This evidence shows the states were confused where the border was. US was not justified in going to war because no one knows where the border really is.
Another reason is Americans invaded land of Mexico. Mexico considered Texas as their state(Polk,325). General Zachary Taylor arrived at Rio Grande across from the city of Matamoros,thus occupying territory in dispute and increasing possibilities of a confrontation. US made an outright attack on Mexico(Marquez,327). This evidence shows the US was unjustified in going to war with Mexico because united states entered Mexico land. Final reason the Mexican War was unjustified was Mexico have different type of rules.A mexico rule was slavery was illegal(Summer,329). After achieving independence from Spain.The mexicans had different type of beliefs than americans. Mexico was Catholic and anti -slavery and had Texas(Roden,317).Americans were protestant,por-slavery, and largely ignored Mexican authority. Mexico ran their government differently than american do. US was unjustified in going to war with Mexico because they didn’t have enough