James K. Polk's Presidency

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Why did the United States go to war with Mexico?

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The United States of America had an ideology of Manifest Destiny. The idea of Manifest Destiny was that Americans were chosen by God to settle the whole continent. To many this meant that the country could be settled from "sea to shining sea". As Americans moved westward, they settled in...

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The United States of America had an ideology of Manifest Destiny. The idea of Manifest Destiny was that Americans were chosen by God to settle the whole continent. To many this meant that the country could be settled from "sea to shining sea". As Americans moved westward, they settled in Mexican territory. This was partly due to an invitation by Mexico to Americans. The Americans could live in the territory as long as they pledged allegiance to Mexico and converted to Catholicism. The Americans did not like how Texas was governed. Therefore, in 1835, Texas began fighting for its independence from Mexico.

In 1836, Texas obtained its Independence from Mexico.The United States annexed Texas into the nation in 1846. A dispute ensued over the southern border of Texas. The Mexicans believed the border was the Nueces River, and the United States stated it was the Rio Grande River. While patrolling the area between the Nueces River and the Rio Grande River, several American soldiers were shot and killed. President James K. Polk asked Congress to go to war against Mexico. 

 

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