Polk informed congress that: 'The cup of forbearance had been exhausted even before the recent information from the frontier of the Del Norte. When word reached Washington, D.C., two weeks later, President James K.

The site of this battlefield is now preserved as Palo Alto Battlefield National Historical Park. On April 24, Mexican forces crossed the Matamoros River to break the blockade Taylor sent a small force to respond, and the Mexican Army opened fire, killing 11 American soldiers. The US Navy then cut Matamoros off from the Gulf of Mexico, creating a blockade by land and water of the Mexican civilians and soldiers just across the Nueces River from Taylor’s forces. On April 9, Taylor’s army deployed the bulk of its artillery within striking distance of the 16,000 person city of Matamoros, Mexico. It looks as if the government sent a small force on purpose to bring on a war, so as to have a pretext for taking California and as much of this country as it chooses.” Colonel Hitchcock, who served with Zachary Taylor’s army, could see the real intention of his deployment from his vantage point on the front lines: “We have not one particle of right to be here. Polk knew this action would antagonize Mexican military forces stationed within sight of Taylor’s army at Matamoros. In April, an army of approximately 4,000 men lead by General Zachary Taylor entered the Nueces Strip, a contested territory that Mexico and many Americans regarded as never having been a part of Texas. On January 13, 1846, Polk ordered American forces into deeply disputed territory. Rather than ameliorate this problem, President Polk intentionally worked to aggravate Mexico and provoke a war. Mexico did not recognize Texas as legitimate American territory and Texas admission to the United States antagonized Mexican officials and citizens. The immediate cause of the Mexican-American War was a disputed boundary between the United States and Texas on the Nueces Strip. For the major military leaders of the Civil War on both the Confederate and Union sides, including such Pig War figures as Winfield Scott, George Pickett, and William Harney, it was a crucible in which their skills were tested, their tactics were formed, and they built the bonds of camaraderie that they relied on during the Civil War. For proponents of slavery and abolition, the new territory provided a source of conflict over whether slavery would expand and continue in the West. American success in the war solidified belief in the concept of Manifest Destiny, confirming the idea that the United States had been destined by divine entities to expand into a continental empire resembling the present-day nation. It added the states of California, Texas, New Mexico, Utah, Arizona, Nevada, and parts of Colorado and Wyoming to the United States. It paved the way for so many other important events, from the expansion and dispossession of indigenous people, the California Gold Rush, and American Civil War. The Mexican-American War is one of the least known pivotal moments in US History.

On May 13, 1846, the United States declared war on Mexico, beginning the Mexican-American War.

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