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The Mexican War

The U.S.-Mexican War began on April 25, 1846. It ended nearly two years later with the signing of the Treaty of Guadalupe Hidalgo, on February 2, 1848. Although the war was one of the most momentous conflicts of the nineteenth century, most Americans seem to know little about it today. Frequently, they confuse it with the Texas Revolution (1835-1836), the Spanish-American War (1898), or the border skirmishes with Mexican Revolutionaries that took place between 1913 and 1916. This situation is probably due in part to the overshadowing of the U.S.-Mexican War by the American Civil War, a much larger and more protracted conflict.

Since end of the U.S.-Mexican War, historians have been divided in their interpretations. Some have held the United States cupable. Others blame Mexico. Studies of the literature reveal the majority of writers have taken a balanced view, holding neither country entirely blameless.

Although Whigs such as Massachusetts Congressman John Quincy Adams and Illinois Congressman Abraham Lincoln were opposed to the war, most Americans enthusiastically supported it. At the time of the war, one celebrated critic, the writer Henry David Thoreau, was virtually unknown outside his hometown of Concord, Massachusetts and almost certainly had no influence on public opinion. Approximately 75,000 men eagerly enlisted in volunteer regiments raised by the various states, including Massachusetts, where Whig opposition to the war was strongest. Thousands more enlisted in the regular U.S. Army. There was no need for a draft. In some places, so many men flocked to recruiting stations that large numbers had to be turned away. Thousands of newly-arrived Irish and German immigrants also heeded the call to arms.

The initial battles of the war, Palo Alto and Resaca de la Palma, took place on Texas soil. Today, Palo Alto Battlefield National Historic Site, located near Brownsville, Texas, is the only U.S.-Mexican War battlefield in the U.S. National Parks system. All subsequent battles were fought in Mexico, California, and New Mexico.

The Treaty of Guadalupe Hidalgo, which ended the war, is still in force today. It not only fixed the Rio Grande as the boundary of Texas but required Mexico to cede to the U.S., in return for $15 million, all the territory that today makes up the states of California, Arizona, New Mexico, Nevada, Utah, and parts of Colorado and Wyoming. At the time of the cession, the Republic of Mexico exercised very little actual control over this territory, which contained less than 1% of the country's population nor was anyone aware of the gold, silver, and other minerals that would later be found there.

In 1835 the Anglo-American settlers of Texas, aided by private citizens from the United States and a handful of Tejano compatriots, rebelled against the government of Mexico. On March 2, 1836 they declared Texas an independent republic. When Mexican President Antonio Lopez de Santa Anna led an army into Texas to put down the rebellion, he was defeated and captured by General Sam Houston at the Battle of San Jacinto, April 21, 1836. While a prisoner, Santa Anna ordered his troops to leave Texas and signed the secret Treaty of Velasco, which recognized both Texian independence and the Rio Grande as the boundary of Texas. Although the Mexican Congress repudiated the treaty, the Republic of Texas maintained its independence. Moreover, an act of the Texian Congress declared the Rio Grande to be the fledgling republic's southwestern boundary, despite the fact that as a Mexican province the border of Texas had been the Rio Nueces, some 160 miles further north. In 1842 the Texians went so far as to send a military expedition, which was unsuccessful, to occupy Santa Fé, New Mexico, a city which lay within the boundary claimed by Texas.

For nearly ten years the Republic of Texas was an independent country, recognized by the United States, France, Great Britain, and Belgium. Mexico, on the other hand, refused to accept the loss of Texas, considering it to be Mexican territory under the temporary rule of a rebel government. Consequently, when the United States formally offered terms of annexation to Texas in 1845 (shortly before James K. Polk was sworn in as President), Mexico recalled her ambassador, charging that the annexation of Texas was the same as an act of war.

In an effort to prevent Texas being annexed by the United State, Mexico belatedly offered to recognize the independence of the Republic of Texas in a "preliminary to a treaty" promoted by certain individuals in both Mexico and its former province. Because it was conditional upon Texas remaining independent of all countries (including the United States), this move failed to gain support in Texas. On July 4, 1845 a Texas convention accepted the U.S. offer, a decision which was overwhelmingly affirmed by the voters of Texas in the fall. On December 29, 1845, Texas was formally admitted to the Union.

After Mexican leaders threatened to invade Texas, for purpose of reconquering the lost province, the governments of both the Republic of Texas and the United States mutually agreed that the U.S. would station troops on Texas soil as soon as the offer of annexation was accepted. By the end of August 1845, Brigadier General Zachary Taylor (nicknamed "Old Rough and Ready") and his men were in place at Corpus Christi, with more troops arriving almost daily to add to the strength of Taylor's "Army of Occupation."

During the fall of 1845 Mexico agreed to receive a U.S. diplomat for the purpose of negotiating a peaceful solution to the two countries' differences. In addition to the question of whether or not Texas was free to join the American union, there was a matter of numerous unpaid claims against the Mexican government by private U.S. citizens. Exercising the discretion granted him by the Secretary of War, General Taylor held his troops at Corpus Christi, so as not to antagonize Mexico by moving deeper into the so-called "Nueces Strip," a thinly-populated territory lying between the Rio Nueces on the north and the Rio Grande on the south.

By the time John Slidell, the American envoy appointed by President Polk, arrived in Mexico, the government was in political turmoil and refused to receive him. While Slidell was in Mexico, attempting in vain to carry out his mission, the moderate government of President Herrera was overthrown by the militant Manuel Paredes. After Paredes became President of Mexico relations between the two countries went from bad to worse.

On January 13, 1846, realizing that negotiations were no longer possible, President Polk instructed General Taylor, through Secretary of War Marcy, to take up a defensive position on the north bank of the Rio Grande. In March 1846 Taylor and his men left Corpus Christi. Upon arrival in the Lower Rio Grande Valley they set up a supply depot at Point Isabel and constructed an earthen fieldwork opposite Matamoros. Not surprisingly, the Mexican military commander in Matamoros, Francisco Mejia, responded by making threats and demanding that the Americans withdraw.

Zachary Taylor, being a dutiful old soldier, refused to budge, telling General Mejia that he'd been sent there by the President of the United States and until Polk directed him to leave, he intended to stay. Taylor also informed the Mexicans that in his opinion he had not taken any hostile action, although the Mexican government claimed that the mere presence of the troops was a hostile act. Taylor declared that if a war began, the responsibility for it would lie with whomever fired the first shot, something he and his troops did not intend to do.

As a precautionary measure General Taylor asked the U.S. Navy (its considerable contributions to the U.S. war effort often overlooked) to blockade the mouth of the Rio Grande. He considered it a fair response to the state of war which the Mexicans insisted already existed. In a letter to General Pedro Ampudia, who superseded Mejia, Taylor adamantly maintained it was a nothing more than a defensive measure.

During this same uneasy period, the Mexicans encouraged U.S. soldiers to desert by clandestinely distributing circular letters in the American camp. These letters were openly addressed to the foreign-born soldiers of the U.S. army, appealing, in the case of those from other Roman Catholic countries (particularly Ireland) to come to the aid of a fellow Catholic country (Mexico). Generous offers of land may have convinced both Catholic and Protestants to swim the river. General Taylor's response to what soon became a worrisome problem was to order his pickets to shoot on sight any U.S. soldier seen swimming to the south bank of the Rio Grande. After at least two men were dealt with in this manner, sinking beneath the muddy waters of the river, desertions dramatically declined.

On April 10, 1846 Colonel Trueman Cross, a veteran officer, failed to return from horseback riding near the American fort. Several days later the skeletal remains of Cross' body were discovered not far from the American encampment. Because his death appeared to have been caused by civilians, rather than by Mexican soldiers, General Taylor did not consider the Colonel's murder a warlike act of the Mexican government.

Throughout April 1846 tension mounted along the border. During this period the Mexican government first sent Pedro Ampudia to head the Mexican forces at Matamoros. Ampudia was soon superseded by Mariano Arista. The number of Mexican troops at Matamoros also greatly increased during that anxious month and before April ended, there were probably in excess of 6,000 soldados encamped across the river from the American earthworks now named "Fort Texas." This was more than twice the number Taylor commanded.

On April 24, 1846, Mariano Arista addressed a letter to Zachary Taylor in which he made it clear that it was only a matter of time before the forces under his command would cross over the Rio Grande and attack Taylor's "Army of Occupation." During the month it had taken for the Mexican government to assemble a large force at Matamoros to oppose them, the Americans had built substantial fortifications at both Point Isabel and the camp opposite Matamoros. When the time came to respond, Taylor and his men were ready.



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Attempts To Secure Mexican Agreement | Largest Assembly Of American Troops Since 1812 | America's Hold On Mexico's Northern Provinces Was Secure | The First Major Amphibious Landing In The History Of The U.S. Army | The Treaty Of Guadalupe Hidalgo | A Novelty In The History Of Nations | War With Mexico Was One Of The Most Important And Most Consequential Events In Our History | The Civil War Was Largely The Outgrowth Of The Mexican War | From Tripoli To The Halls Of The Montezumas | North America's Westernmost Province | The Pacific Squadron | The San Patricio Battalion | A Precious Set Of Scoundrels
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