Answer:
American went to war with Mexico in the Mexican-American war for several reasons. One reason was that in March 1845 Mexico severed ties with America due to the annexation of Texas (Britannica). Following this, the eleventh president, President James Polk sent the Columbia graduate John Slidell to renegotiate with the Mexican government- the Texas border, for settling US claims against Mexico, and buying theat the time were under Mexican control, New Mexico and California, only for the Mexican president to refuse to receive him due to his knowledge of the US' plans to dismember Mexico, only for the news to get back to Polk, who sent General Taylor's troops to land between the Rio Grande and the Nueces,only for sixteen of them to end up either killed or injured on their own soil on April 25th, after he had already started drafting a proposal for war because of the refusal to pay US claims, but hastened the writing, instead drawing attention to the slaughter on their own soil, which upon delivery to the Congress on May eleventh was deemed iredeemable, and the US went to war.
Explanation:
Most of this information comes from the Britannica page.
