Mexico has long insisted that its northern border was along the Nueces River. The United States said the border was further south, along the Rio Grande. In June 1845, President Polk ordered General Zachary Taylor to lead an army into the disputed region. I believe the United States should not have entered the Mexican-American War because the northern part of the United States had political interests opposed to adding a new slave state. The Mexican government also wanted border raids and warned that any attempted takeover would lead to war. I think it is unjustified to provoke a war on a border territory. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get the original essay America is trying to expand and gain more land, so when it was offered to buy land off the coast of Mexico, it wasn't meant to be a threat or a way to anger the Mexico. The United States believes that it can do the job itself and that it is unfair for other humans to do it for them. In the north, they also feared a spread of slavery into the lands of the southwest. Mexico was rightly trying to crush a rebellion in Texas, and the Americans intervened on Texas's behalf. President Polk believed that the United States had a manifest destiny: to expand across the continent to the Pacific Ocean. Overall, there were many cultural differences between the Mexican and American settlers in the area. There is also Mexico's refusal to admit the independence of Texas and its entry into the United States. I think the Mexican-American War had a huge impact on the tension between the Northern and Southern states before the Civil War. I think this because this war marked the first American armed conflict fought on foreign soil. He opposed political division and a militarily ill-prepared Mexico against the administration of U.S. President James K. Polk. The fight took place along the Rio Grande and sparked the fighting and was followed by numerous victories for the United States. Mexico had lost about a third of its territory, including almost all of present-day California, Utah, Nevada, Arizona, and New Mexico. In February 1848, the United States and Mexico signed the Treaty of Guadalupe Hidalgo, which officially ended the war and required Mexico to cede much of its northern territory to the United States. I think it's a very important part of history and it has impacted the lives we live today..