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A map of the Oregon territory during the period of joint occupation by the United States and Great Britain shows the area whose ownership was contested by the two powers. The uppermost region is labeled “Rupert’s Land (British),” which lies in between the “54° 40′- Extreme U.S. Claim” and “49°” lines. The central region, which lies in between the “49°” and “42° - Extreme British Claim” lines, contains Oregon Country. Beneath the “42° - Extreme British Claim” line lies Mexico.
This map of the Oregon territory during the period of joint occupation by the United States and Great Britain shows the area whose ownership was contested by the two powers.

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.

Finally, after nearly a decade of public clamoring for the annexation of Texas, in December 1845 Polk officially agreed to the annexation of the former Mexican state, making the Lone Star Republic an additional slave state. Incensed that the United States had annexed Texas, however, the Mexican government refused to discuss the matter of selling land to the United States. Indeed, Mexico refused even to acknowledge Polk’s emissary, John Slidell, who had been sent to Mexico City to negotiate. Not to be deterred, Polk encouraged Thomas O. Larkin, the U.S. consul in Monterey, to assist any American settlers and any Californios    , the Mexican residents of the state, who wished to proclaim their independence from Mexico. By the end of 1845, having broken diplomatic ties with the United States over Texas and having grown alarmed by American actions in California, the Mexican government warily anticipated the next move. It did not have long to wait.

War with mexico, 1846–1848

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.

A map titled “Texas Claims” indicates the borders of Mexico, Texas, the United States, and “Disputed Territory,” as well as the Rio Grande, the Arkansas River, and the Nueces River.
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.

In January 1846, the U.S. force that was ordered to the banks of the Rio Grande to build a fort on the “American” side encountered a Mexican cavalry unit on patrol. Shots rang out, and sixteen U.S. soldiers were killed or wounded. Angrily declaring that Mexico “has invaded our territory and shed American blood upon American soil,” President Polk demanded the United States declare war on Mexico. On May 12, Congress obliged.

Questions & Answers

what is taring and feathering?
Dominic Reply
Isnt there any laws in place for gun control?
Ryan Reply
How would you characterize the former president’s reaction? What do you think he means by writing that the Missouri Compromise line “is a reprieve only, not a final sentence”?
Tonda Reply
Compare and contrast the steamboats of the antebellum years with technologies today. In your estimation, what modern technology compares to steamboats in its transformative power?
Tonda Reply
airplanes to jets. Another would be electric trains.
Darren
I would say the Internal Combustion engine was as if not more transformative the the Steam power which it replaced. The ability of the Steamboat to rapidly move large amounts of goods through the water ways that weave there way from town to town increased our fledgling country's economy. I can draw direct coraleris with the National highway system built during the 1950's that were soon clogged with Transport trucks using I.C.E.
Pancho
what are the impact of the missionaries on indigenous knowledge of black communities
Don Reply
What were the initial issues that lead to the introduction of legislation
Benedicta Reply
what is the main title of franklin D roosevelt
Allan Reply
the president of the USA
Yangduk
who abolish slavery
ABDOURAHMAN Reply
Abraham Lincoln
Yangduk
who was the fists empire in americans
Alex Reply
who organized the most massive attack in American History, which caused the Germans to begin to retreat in September 1918?
Jmora Reply
"Black Jack" Pershing
Victor
Is there answers anywhere to all of the critical thinking questions?
Heather Reply
What were the direct causes of the civil war
Trinity Reply
How did slavery issues effect the war
Trinity
How were politics involved
Trinity
north wanted to unify the south
Maleek
south wanted independence
Maleek
freeing slaves was just a way to recruit black soldiers to fight for north
Maleek
Lincoln couldn't let the south separate from the union , agriculture was way to valuable
Maleek
South felt North was opposing their interests and would be better off as a separate nation
Victor
progressive reforms under Theodore Roosevelt
Karpi Reply
TR was determined to pursue the public interest
Victor
what was the main thing suposed to happen when the tea party
Gavin Reply
Which plan resolved the issue of representation for the U.S. Constitution?
Nichole Reply
The plan which became known as the seventeenth amendmet.
WIlliam
amendmet because not an article of bill of rights.
WIlliam

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Source:  OpenStax, U.s. history. OpenStax CNX. Jan 12, 2015 Download for free at http://legacy.cnx.org/content/col11740/1.3
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