The United States declares war on Mexico as part of a bitter clash over control of what’s now Texas. After war was declared, American troops moved into the disputed territory and eventually marched on to Mexico City. In 1848, the Treaty of Guadalupe Hidalgo was signed, establishing the Rio Grande as the U.S.-Mexican border. As part of the treaty, Mexico recognized the annexation of Texas and agreed to sell California to America for $15 million. The U.S. gained roughly 525,000 square miles (1,359,743.76 square kilometers) as a result of the treaty.
On May 13, 1846, the U.S. Congress declared war on Mexico, primarily due to disputes over Texas and border tensions. This declaration led to the Mexican-American War, which lasted until 1848 and resulted in significant territorial gains for the United States.
Background of the Declaration
On May 13, 1846, the U.S. Congress officially declared war on Mexico. This decision stemmed from ongoing disputes over Texas and escalating tensions along the border. The annexation of Texas by the United States in 1845 had already strained relations, as Mexico viewed this as an act of aggression.
Key Events Leading to War
- Texas Independence: Texas gained independence from Mexico in 1836, but the boundary between Texas and Mexico remained disputed.
- Annexation of Texas: The U.S. annexed Texas in 1845, which Mexico considered illegal.
- Border Disputes: The U.S. claimed the Rio Grande as the border, while Mexico insisted it was the Nueces River.
- Military Incidents: Tensions escalated when U.S. troops were sent to the disputed area, leading to skirmishes that were perceived as provocations.
Congressional Action
The declaration of war was passed overwhelmingly by Congress, reflecting a strong sentiment for expansionism, often referred to as Manifest Destiny. President James K. Polk played a crucial role in advocating for the war, citing the need to protect American interests and territory.
Outcomes of the War
The Mexican-American War lasted until 1848 and resulted in significant territorial gains for the United States, including:
The declaration of war was passed overwhelmingly by Congress, reflecting a strong sentiment for expansionism, often referred to as Manifest Destiny. President James K. Polk played a crucial role in advocating for the war, citing the need to protect American interests and territory.
Outcomes of the War
The Mexican-American War lasted until 1848 and resulted in significant territorial gains for the United States, including:
- Territory Gained Area (Approx.)
- California 163,696 square miles
- New Mexico 121,590 square miles
- Arizona 113,990 square miles
- Nevada 110,572 square miles
- Utah 84,899 square miles
- Texas 268,596 square miles
The war concluded with the Treaty of Guadalupe Hidalgo, which formalized these territorial changes and established the Rio Grande as the southern border of Texas.
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