On This Day: U.S. invasion of Mexico ends in California, continues south - Jan. 13, 1847
(edited from Wikipedia)
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[Invasion background]
The Mexican–American War was an invasion of Mexico by the United States Army from 1846 to 1848.
It followed the 1845 American annexation of Texas, which Mexico still considered its territory because Mexico refused to recognize the Treaties of Velasco. This treaty was signed by President Antonio López de Santa Anna while he was captured by the Texian Army during the 1836 Texas Revolution. The Republic of Texas was de facto an independent country, but most of its Anglo-American citizens who had moved from the United States to Texas after 1822 wanted to be annexed by the United States.
Sectional politics over slavery in the United States were preventing annexation because Texas, formerly a slavery-free territory under Mexican rule, would have been admitted as a slave state, upsetting the balance of power between Northern free states and Southern slave states. In the 1844 United States presidential election, Democrat James K. Polk was elected on a platform of expanding U.S. territory to Oregon, California (also a Mexican territory), and Texas by any means, with the 1845 annexation of Texas furthering that goal.
However, the boundary between Texas and Mexico was disputed, with the Republic of Texas and the U.S. asserting it to be the Rio Grande and Mexico claiming it to be the more-northern Nueces River. Polk sent a diplomatic mission to Mexico in an attempt to buy the disputed territory, together with California and everything in-between for $25 million (equal to equivalent to $750,636,132 in 2022), an offer the Mexican government refused.
Polk then sent a group of 80 soldiers across the disputed territory to the Rio Grande, ignoring Mexican demands to withdraw. Mexican forces interpreted this as an attack and repelled the U.S. forces on April 25, 1846, a move which Polk used to convince the Congress of the United States to declare war.
Beyond the disputed area of Texas, U.S. forces quickly occupied the regional capital of Santa Fe de Nuevo México along the upper Rio Grande. U.S. forces also moved against the province of Alta California and then turned south.
Conquest of California
Commodore John D. Sloat, commander of the U.S. Navy's Pacific Squadron, near Mazatlan, Mexico, had received orders to seize San Francisco Bay and blockade California ports when he was positive that war had begun. Sloat set sail for Monterey, reaching it on July 1. On July 9, 70 sailors and Marines landed at Yerba Buena and raised the American flag. Later that day in Sonoma, the Bear Flag was lowered, and the American flag was raised in its place.
On July 15, Sloat transferred his command of the Pacific Squadron to Commodore Robert F. Stockton, who was more militarily aggressive. He mustered the willing members of the California Battalion into military service with Frémont in command. Stockton ordered Frémont to San Diego to prepare to move northward to Los Angeles. As Frémont landed, Stockton's 360 men arrived in San Pedro. General Castro and Governor Pío Pico wrote farewells and fled separately to the Mexican state of Sonora.
Stockton's army entered Los Angeles unopposed on August 13, whereupon he sent a report to the secretary of state that "California is entirely free from Mexican dominion."
The Californios under the leadership of José María Flores, acting on their own and without federal help from Mexico, in the Siege of Los Angeles, forced the American garrison to retreat on September 29. They also forced small U.S. garrisons in San Diego and Santa Barbara to flee.
Captain William Mervine landed 350 sailors and Marines at San Pedro on October 7. They were ambushed and repulsed at the Battle of Dominguez Rancho by Flores' forces in less than an hour. Stockton arrived with reinforcements at San Pedro, which increased the American forces there to 800.
Meanwhile, Kearny and his force of about 115 men, who had performed a grueling march across the Sonoran Desert, crossed the Colorado River in late November 1846. On December 7,100 lancers under General Andrés Pico (brother of the governor), tipped off and lying in wait, fought Kearny's army of about 150 at the Battle of San Pasqual. General Pico kept the hill under siege for four days until a 215-man American relief force arrived.
Frémont and the 428-man California Battalion arrived in San Luis Obispo on December 14 and Santa Barbara on December 27. On December 28, a 600-man American force under Kearny began a 150-mile march to Los Angeles. On January 8, 1847, the Stockton-Kearny army defeated the Californio force in the two-hour Battle of Rio San Gabriel. The next day, January 9, the Stockton-Kearny forces fought and won the Battle of La Mesa. On January 10, the U.S. Army entered Los Angeles to no resistance.
[Californio capitulates]
On January 12, Frémont and two of Pico's officers agreed to terms for a surrender. Articles of Capitulation were signed on January 13 by Frémont, Andrés Pico and six others at a ranch at Cahuenga Pass (modern-day North Hollywood). This became known as the Treaty of Cahuenga, which marked the end of armed resistance in California.
[Invasion continues]
The U.S. Army, under Major General Winfield Scott, invaded the Mexican heartland and captured the capital, Mexico City, in September 1847.
[Mexico loses more than half its territory]
Although Mexico was defeated on the battlefield, negotiating peace was a politically fraught issue. Some Mexican factions refused to consider any recognition of its loss of territory. Although Polk formally relieved his peace envoy, Nicholas Trist, of his post as negotiator, Trist ignored the order and successfully concluded the 1848 Treaty of Guadalupe Hidalgo. It ended the war, and Mexico recognized the cession of present-day Texas, California, Nevada, and Utah as well as parts of present-day Arizona, Colorado, New Mexico, and Wyoming. The U.S. agreed to pay $15 million for the physical damage of the war and assumed $3.25 million of debt already owed by the Mexican government to U.S. citizens. Mexico relinquished its claims on Texas and accepted the Rio Grande as its northern border with the United States, a loss of 55% of its territory.
[Aftermath]
The victory and territorial expansion Polk envisioned inspired patriotism among some sections of the United States, but the war and treaty drew fierce criticism for the casualties, monetary cost, and heavy-handedness. The question of how to treat the new acquisitions intensified the debate over slavery in the United States. Although the Wilmot Proviso that explicitly forbade the extension of slavery into conquered Mexican territory was not adopted by Congress, debates about it heightened sectional tensions. Some scholars see the Mexican–American War as leading to the American Civil War. Many officers who had trained at West Point gained experience in the war in Mexico and later played prominent leadership roles during the Civil War.
In Mexico, the war worsened domestic political turmoil. Since the war was fought on home ground, Mexico suffered large losses of life from both the military and civilian population. The nation's financial foundations were undermined, and more than half of its territory was lost. Mexico felt a loss of national prestige, leaving it in what a group of Mexican writers, including Ramón Alcaraz and José María del Castillo Velasco, called a "state of degradation and ruin... [As for] the true origin of the war, it is sufficient to say that the insatiable ambition of the United States, favored by our weakness, caused it."
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https://en.wikipedia.org/wiki/Mexican%E2%80%93American_War
https://en.wikipedia.org/wiki/Treaty_of_Cahuenga
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