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The following peace treaty of Guadalupe Hidalgo gave the U.S. an excruciating mount of Mexican land although there was nothing the Mexicans could do. The capital of Mexico city was already taken and the army was in ruin, it had to be done. And so on February 2nd, 1848 it was signed and the humiliation of Mexico was complete. The Mexicans had learned their lesson and so when the U.S. asked to buy a small piece of land which we call the Gadsden Purchase happened and yet more Mexican land was given to the U.S. in 1853. Manifest destiny had fueled American expansionism and this war showed it.

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The War started on April 25th, 1846, the Mexicans were not in shape for war. The first major battle happened at Palo Alto on May 8th, 1846 and it was a firm American victory. The second major battle happened the small town of Buena Vista where the much larger Mexican Army was repealed by the new American Artillery, again technology would win a war. The Mexican Army had to retreat. At the Battle of Cerro Gordo the smaller American Army encircled the fortified, larger Mexican Army. Again the superior general won the day, who in this case was Winfield Scott, but the Mexicans also had a good general who was defeated named Antonio Lopez de Santa Anna. One of the last major battles was the Battle of Monterrey. In the battle General Pedro de Ampudia, leader of the Northern Army was defeated by the American Volunteers and Texas Rangers commanded by the future president Zachary Taylor. By 1847 Mexico city had fallen and Santa Anna was declared the new president. He led his gorilla armies to try to take back the town of Puebla and what followed was a siege, but the Americans went out to fight the Mexicans and the they won finishing the Mexicans and was the last major battle of the war. Peace talks started and with that Manifest Destiny was almost complete for the U.S. This was the finishing of Mexican power and with it the United States became the leading power in North America taking more than 1/3 of the land of Mexico. It was this war that solidified the United States as a major power.

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11th President of the United States James K. Polk 

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11th President of the United States James K. Polk 

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Before the war started Mexico was still angry from Texas getting its independence in 1836 along with several other independence movements such as Yucatan which stayed a country for 7 years until it joined Mexico again in 1848. America at the time as well as Mexico were young countries and the American president James K Polk believed in Manifest Destiny which is basically the theory that the U.S. must move Westwards to survive. He wanted to pay Mexico 30 million dollars to Purchase New Mexico and California, but Mexico refused and lets just say Mr. Polk wan't very thrilled. He decided to send in troops to Texas where he probably fully intended to start a fight, and he did. The U.S. saw this as a declaration of war and formally declared war. Mexico was not ready for war, especially with the United States which had better cavalry and generals. Some of the generals include future president Ulysses S. Grant, future president Zachary Taylor, famous military commander Winfield Scott, future president Franklin Pierce, and the famous general George Meade who would go on to defeat the Confederate general Robert E. Lee at the Battle of Gettysburg. He won an almost impossible battle, he was outnumbered and outgunned, but he still won saving the Union and begging the slow decline of the Confederation.