
After America won the Mexican-American war, many pioneers who lived in the Appalachian west left their home in search of economic opportunity. They associated Westward migration in search of land ownership and farming with freedom. This increased the population of the west helping the Westward expansion.
What did James K. Polk do for westward expansion?
The election of James Polk in 1844 impacted westward expansion because Polk's administration completed the goal of a continental United States extending from the Atlantic Ocean to the Pacific Ocean. Polk's administration established firm northern and southern borders for the United States as well.
What were the causes and effects of the Mexican - American War?
Leading causes of the Mexican War included:
- Texan Annexation. Mexico had warned it would regard annexation as an act of war. ...
- The Boundary Dispute. Regardless of its status (was it an American state or a rebellious Mexican province?), the United States maintained that the southern border of Texas was formed by ...
- The California Question. ...
- Monetary Claims against Mexico. ...
What started the Mexican American War?
The Mexican-American War (1846–1848) was a brutal conflict between neighbors largely sparked by the US annexation of Texas and their desire to take western lands such as California away from Mexico. The war lasted about two years in total and resulted in a victory for the Americans, who benefited greatly from the generous terms of the peace treaty following the war.
What was the significance of westward expansion?
Westward Expansion is viewed as the main theme of the history of America during the 18 th century and as the central factor in American history shaping. The greatest influence or force that shaped American society and democracy is the availability of vast free land in the West which affected profoundly the American society.

Did westward expansion cause the Mexican-American War?
The Mexican-American War of 1846-1848 was a combination of Mexican unwillingness to recognize Texas independence, the desire of Texans for statehood, and American desire for westward expansion.
What was the impact of Mexican-American War?
The Mexican-American war (1846-1848) changed the slavery debate. It almost doubled the size of the United States and began a debate, between Northerners and Southerners, over what to do with the newly acquired land.
How did the Mexican-American War affect Manifest Destiny?
By the end of the war, Mexico would lose almost half its territory to the U.S., including lands from Texas to California. The war was a key event in American History as it fulfilled its 'manifest destiny', encompassing land from the Atlantic Ocean to the Pacific.
What role did westward expansion and the Mexican-American War play in causing the Civil War?
The philosophy drove 19th-century U.S. territorial expansion and was used to justify the forced removal of Native Americans and other groups from their homes. The rapid expansion of the United States intensified the issue of slavery as new states were added to the Union, leading to the outbreak of the Civil War.
What were three results of the Mexican War?
Mexico ceded nearly all the territory now included in the U.S. states of New Mexico, Utah, Nevada, Arizona, California, Texas, and western Colorado for $15 million and U.S. assumption of its citizens' claims against Mexico.
What were the long term effects of the Mexican-American War?
The treaty effectively halved the size of Mexico and doubled the territory of the United States. This territorial exchange had long-term effects on both nations. The war and treaty extended the United States to the Pacific Ocean, and provided a bounty of ports, minerals, and natural resources for a growing country.
What started westward expansion?
Westward expansion, the 19th-century movement of settlers into the American West, began with the Louisiana Purchase and was fueled by the Gold Rush, the Oregon Trail and a belief in "manifest destiny."
What did America gain from the Mexican War?
Mexico received a little more than $18 million in compensation from the United States as part of the treaty. The pact set a border between Texas and Mexico and ceded California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming to the United States.
What were the consequences of the Mexican-American War quizlet?
That the US got the Mexican Cession and the disputed territory of Texas and in return paid Mexico $15 million. How much did the Mexicans and Americans gain or lose of their land as a result of the Mexican American War? The US increased its land by 25%. Mexico lost half of its territory.
What was most impactful on westward expansion?
The California Gold Rush was a major factor in expansion west of the Mississippi. That westward expansion was greatly aided by the completion of the Transcontinental Railroad in 1869, and passage of the Homestead Act in 1862.
What was the biggest impact of westward expansion?
Westward Expansion had the biggest impact on the economy and there were several positive outcomes as a result of Manifest Destiny. First, Westward Expansion led to the creation of many new technologies including steamboats, canals and the transcontinental railroads.
How did the Treaty of Guadalupe Hidalgo impact America's westward expansion?
The treaty added an additional 525,000 square miles to United States territory, including the land that makes up all or parts of present-day Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming. Mexico also gave up all claims to Texas and recognized the Rio Grande as America's southern boundary.
What did the US gain from the Mexican-American War?
Under the terms of the treaty negotiated by Trist, Mexico ceded to the United States Upper California and New Mexico. This was known as the Mexican Cession and included present-day Arizona and New Mexico and parts of Utah, Nevada, and Colorado (see Article V of the treaty).
What were the causes of the Mexican-American War?
Leading causes of the Mexican War included:Texan Annexation. Mexico had warned it would regard annexation as an act of war. ... The Boundary Dispute. ... The California Question. ... Monetary Claims against Mexico.
How did the Mexican-American War end?
The Treaty of Guadalupe Hidalgo, which brought an official end to the Mexican-American War (1846-48), was signed on February 2, 1848, at Guadalupe Hidalgo, a city to which the Mexican government had fled with the advance of U.S. forces.
Who took control of Mexico?
Stephen Kearny took control over Mexico without firing a single shot. Kearny joined forces with Fremont to have California under control in weeks. Mexico seemed to have the advantage when their troops outnumbered the American troops, but the United States were a stronger nation and soon overpowered the Mexicans.
Why did Polk send American troops to Texas?
Afterwards, he sent American troops to Texas to provoke the Mexicans into war. Mexicans fired upon American troops on April 25, 1846 and Polk declared the U.S. at war with it's neighboring country.
Who was the 11th president of the United States during the Mexican American War?
Mexican American War Timeline- This shows all the important events that had occurred during the war. James K. Polk, the 11th president of the United States, supported manifest destiny and wanted to fight for land for his own benefit. In the year of 1844, President James K. Polk supported manifest destiny, the belief that it was America's right ...
Who captured Mexico City?
Winfield Scott's army attacked and captured the Mexican capital, Mexico City, in September 1847. Mexico signed the Treaty of Guadalupe Hidalgo in 1848, handing over New Mexico, California and Texas for $15 million. Some Americans did not think America should have waged a war with Mexico.
What was the impact of the Mexican American War on American society?
On February 2, 1848, the Treaty of Guadalupe Hidalgo was signed which officially ended the Mexican-American War. However, as the guns fell silent, and the men returned home, a new war was brewing, one that continues to shape the course of this country to this day.
What was the result of the Mexican Cession?
As a direct result of the Mexican Cession, the California Gold Rush began in 1849 which caused a massive frenzy to organize and admit California into the Union. The Missouri Compromise stated that any territory north of the 36°30’ parallel would be free; however, the line would divide California into two sections.
Why did many southerners feel betrayed by Taylor, a slaveowner from Louisiana, as they equated?
In this time of heightened sectional tensions, southerners believed that if one did not actively protect slavery and its expansion, one supported abolition.
What was the effect of the compromise of 1850?
While controversial, the Compromise of 1850 alleviated the growing tensions over slavery and delayed a full-blown crisis over the issue.
How much territory did Mexico give to the United States?
With the Treaty of Guadalupe Hidalgo, Mexico ceded over 525,000 square miles of territory to the United States in exchange for $15 million and the assumption of Mexican debts to American citizens, which reopened the slavery issue. In order to promote party loyalty without aggravating sectional tensions, the Whigs did not include specific ...
Which party supported slavery in the 1848 election?
Consequently, the Whigs and the Democrats developed campaign materials to be sectionally distributed which highlighted their candidate's support and opposition for slavery respectively.
When did California become a state?
California was never a US territory and approved a free constitution, elected a Governor and legislature and applied for statehood by November 1849. Since California did not wish to be divided into two separate states, a new compromise was formed, aptly named the Compromise of 1850. Under the Compromise of 1850, ...
What is the meaning of "Westward Expansion"?
Whenever there is a conflict or situation with territorial more than likely there a fight or war involved. The Westward expansion was no different. While there was people like John O’Sullivan who was advocates for westward expansion, there where people like W.E. Channing who did not agree with the concept of westward expansion or Manifest Destiny.
What were the short term effects of the Louisiana Purchase?
Some long term effects on the territory weren’t good either, such as territorial disputes and the growing tension it brought with slavery. The nation had gained the land from the French, but the Indians still fought back and so did the Spanish on the western border.
Why did John O'Sullivan speak on manifest destiny?
In 1839, John O’Sullivan became an advocate for the idea of Manifest Destiny, which simply mean that the expansions of the westward area of the country was both justified and predictable.
Why did the United States achieve the manifest destiny?
I believe that the United States achieved the Manifest Destiny politically because Americans were able to expand the westward as of the belief of the God-given right. The belief made them to acquire Texas, Oregon, and California.
What does the idea of provoking the war mean?
The idea of provoking the war implies that the war’s happening is the fault of the American people. If this is true, than America is the cause of the loss of countless lives as well. Thus, President Polk established the Mexican American War on the intentional destruction of life which is explicitly banned upon in the nation 's…
Was the Mexican-American war justified?
In my opinion, the Mexican-American war was not justified. Originally, when the Americans began spreading the idea of manifest destiny, the Mexicans, in general, had two attitudes towards it. Some admired this idea, however, some also feared it.
Did Americans support the Westward expansion?
While some Americans supported Westward expansions, there was others who opposed Westward expansions. Also some Americans supported the Mexican War, while others opposed the Mexican war. However, both the Westward expansion and the Mexican war had positive and negative effects to the country we live in today. ...
What was the role of anti-Catholics in the Mexican-American War?
Anti-Catholic sentiment played an important role in the Mexican-American War. The American public widely regarded Roman Catholics as cowardly and vice-ridden, like the clergy in this ca. 1846 lithograph who are shown fleeing the Mexican town of Matamoros accompanied by pretty women and baskets full of alcohol. (credit: Library of Congress)
What was the border between Mexico and the United States?
Expansionistic fervor propelled the United States to war against Mexico in 1846. The United States had long argued that the Rio Grande was the border between Mexico and the United States, and at the end of the Texas war for independence Santa Anna had been pressured to agree. Mexico, however, refused to be bound by Santa Anna’s promises and insisted the border lay farther north, at the Nueces River ( [link] ). To set it at the Rio Grande would, in effect, allow the United States to control land it had never occupied. In Mexico’s eyes, therefore, President Polk violated its sovereign territory when he ordered U.S. troops into the disputed lands in 1846. From the Mexican perspective, it appeared the United States had invaded their nation.
What did Scott do to save Mexico?
Scott captured Veracruz in March 1847, and moving in a northwesterly direction from there (much as Spanish conquistador Hernán Cortés had done in 1519), he slowly closed in on the capital. Every step of the way was a hard-fought victory, however, and Mexican soldiers and civilians both fought bravely to save their land from the American invaders. Mexico City’s defenders, including young military cadets, fought to the end. According to legend, cadet Juan Escutia’s last act was to save the Mexican flag, and he leapt from the city’s walls with it wrapped around his body. On September 14, 1847, Scott entered Mexico City’s central plaza; the city had fallen ( [link] ). While Polk and other expansionists called for “all Mexico,” the Mexican government and the United States negotiated for peace in 1848, resulting in the Treaty of Guadalupe Hidalgo.
What did Polk do to get more land?
In contrast to the diplomatic solution with Great Britain over Oregon, when it came to Mexico, Polk and the American people proved willing to use force to wrest more land for the United States. In keeping with voters’ expectations, President Polk set his sights on the Mexican state of California. After the mistaken capture of Monterey, negotiations about purchasing the port of San Francisco from Mexico broke off until September 1845. Then, following a revolt in California that left it divided in two, Polk attempted to purchase Upper California and New Mexico as well. These efforts went nowhere. The Mexican government, angered by U.S. actions, refused to recognize the independence of Texas.
What was the name of the territory that the United States claimed in 1844?
President Polk—whose campaign slogan in 1844 had been “Fifty-four forty or fight!”—asserted the United States’ right to gain full control of what was known as Oregon Country , from its southern border at 42° latitude (the current boundary with California) to its northern border at 54° 40′ latitude. According to an 1818 agreement, Great Britain and the United States held joint ownership of this territory, but the 1827 Treaty of Joint Occupation opened the land to settlement by both countries. Realizing that the British were not willing to cede all claims to the territory, Polk proposed the land be divided at 49° latitude (the current border between Washington and Canada). The British, however, denied U.S. claims to land north of the Columbia River (Oregon’s current northern border) ( [link] ). Indeed, the British foreign secretary refused even to relay Polk’s proposal to London. However, reports of the difficulty Great Britain would face defending Oregon in the event of a U.S. attack, combined with concerns over affairs at home and elsewhere in its empire, quickly changed the minds of the British, and in June 1846, Queen Victoria’s government agreed to a division at the forty-ninth parallel.
Why was annexing Oregon important?
Annexing Oregon was an important objective for U.S. foreign policy because it appeared to be an area rich in commercial possibilities. Northerners favored U.S. control of Oregon because ports in the Pacific Northwest would be gateways for trade with Asia. Southerners hoped that, in exchange for their support of expansion into the northwest, northerners would not oppose plans for expansion into the southwest.
When did Texas join the United States?
In 1845, when Texas joined the United States, Mexico insisted the United States had a right only to the territory northeast of the Nueces River. The United States argued in turn that it should have title to all land between the Nueces and the Rio Grande as well.
Why was the Mexican American war so unpopular?
That same month, Polk declared war against Mexico, claiming (falsely) that the Mexican army had “invaded our territory and shed American blood on American soil.” The Mexican-American War proved to be relatively unpopular, in part because many Northerners objected to what they saw as a war to expand the “slaveocracy.” In 1846, Pennsylvania Congressman David Wilmot attached a proviso to a war-appropriations bill declaring that slavery should not be permitted in any part of the Mexican territory that the U.S. might acquire. Wilmot’s measure failed to pass, but it made explicit once again the sectional conflict that haunted the process of westward expansion.
What did Jefferson believe about the Westward Expansion?
To Jefferson, westward expansion was the key to the nation’s health: He believed that a republic depended on an independent, virtuous citizenry for its survival, and that independence and virtue went hand in hand with land ownership, especially the ownership of small farms.
What was the Missouri compromise?
The acquisition of this land re-opened the question that the Missouri Compromise had ostensibly settled: What would be the status of slavery in new American territories? After two years of increasingly volatile debate over the issue, Kentucky Senator Henry Clay proposed another compromise. It had four parts: first, California would enter the Union as a free state; second, the status of slavery in the rest of the Mexican territory would be decided by the people who lived there; third, the slave trade (but not slavery) would be abolished in Washington, D.C.; and fourth, a new Fugitive Slave Act would enable Southerners to reclaim runaway slaves who had escaped to Northern states where slavery was not allowed.
What was the Westward Expansion and the Compromise of 1850?
Westward Expansion and the Compromise of 1850. Bleeding Kansas. In 1803, President Thomas Jefferson purchased the territory of Louisiana from the French government for $15 million. The Louisiana Purchase stretched from the Mississippi River to the Rocky Mountains and from Canada to New Orleans, and it doubled the size of the United States.
What was the battle between Kansas and Nebraska?
The battle for Kansas and Nebraska became a battle for the soul of the nation. Emigrants from Northern and Southern states tried to influence the vote. For example, thousands of Missourians flooded into Kansas in 1854 and 1855 to vote (fraudulently) in favor of slavery. “Free-soil” settlers established a rival government, and soon Kansas spiraled into civil war. Hundreds of people died in the fighting that ensued, known as “ Bleeding Kansas .”
What was the Westward Migration?
Westward migration was an essential part of the republican project , he argued, and it was Americans’ “ manifest destiny ” to carry the “great experiment of liberty” to the edge of the continent: to “overspread and to possess the whole of the [land] which Providence has given us,” O’Sullivan wrote.
How many square miles did the Gadsden Purchase add to the United States?
Did you know? In 1853, the Gadsden Purchase added about 30,000 square miles of Mexican territory to the United States and fixed the boundaries of the “lower 48” where they are today.

Causes of The Mexican-American War
The Mexican-American War Begins
- On April 25, 1846, Mexican cavalry attacked a group of U.S. soldiers in the disputed zone under the command of General Zachary Taylor, killing about a dozen. They then laid siege to Fort Texas along the Rio Grande. Taylor called in reinforcements, and—with the help of superior rifles and artillery—was able to defeat the Mexicans at the Battle of Pa...
U.S. Army Advances Into Mexico
- At that time, only about 75,000 Mexican citizens lived north of the Rio Grande. As a result, U.S. forces led by Col. Stephen Watts Kearny and Commodore Robert Field Stocktonwere able to conquer those lands with minimal resistance. Taylor likewise had little trouble advancing, and he captured the city of Monterrey in September. With the losses adding up, Mexico turned to old sta…
Treaty of Guadalupe Hidalgo
- Guerrilla attacks against U.S. supply lines continued, but for all intents and purposes the war had ended. Santa Anna resigned, and the United States waited for a new government capable of negotiations to form. Finally, on Feb. 2, 1848, the Treaty of Guadalupe Hidalgowas signed, establishing the Rio Grande (and not the Nueces River) as the U.S.-Mexican border. Under the tre…
Sources
- The Mexican American War. PBS: American Experience. The Mexican-American war in a nutshell. Constitution Daily. The Mexican-American War. Northern Illinois University Digital Library..