Which factor pushed the United States to go to war against Mexico in 1846?

A. arguments in favor of war from Abraham Lincoln and others in Congress

B. Manifest Destiny and a desire to extend slavery into Mexican territory

C. an invasion by the Mexican army into the southwestern United States

D. years of failed negotiations over the disputed Oregon border

The correct answer is letter B

The Mexican-American War was a conflict between the United States and Mexico, which occurred from 1846 to 1848. The American ambition for Mexican territories was the great motivation for the beginning of the clash. The conflict was one of the various stages of the so-called March to the West. This march aimed to extend the North American territory towards the neighboring country in the 19th century.

The conflict intensified an existing rivalry between Mexicans and Americans. The need for expansion and the objectives with the invasion of the southern territory irritated the Mexicans. Belonging to Mexico, the territories were of great interest to the United States; since, in the future, it would become one of the richest spots in the country. In this clash, about 40 thousand people were killed in the period of two years. Be the victim of direct confrontation or diseases that affected war camps.