At first, the United States declined to consolidate it into the union, to a great extent since northern political interests were against the expansion of another slave state.
The Mexican government was additionally reassuring outskirt attacks and cautioning that any endeavor at extension would prompt war.
Addition systems were immediately started after the 1844 decision of Polk, who crusaded that Texas ought to be "Re-added" and that the Oregon Territory ought to be "Re-involved." Polk likewise had his eyes on California, New Mexico and whatever remains of what is today the U.S. Southwest.
At the point when his offer to buy those terrains was rejected, he incited a battle by moving troops into a debated zone between the Rio Grande and Nueces River that the two nations had already perceived as a major aspect of the Mexican territory of Coahuila.
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officers in the questioned zone under the charge of General Zachary Taylor, executing around twelve.
They at that point laid attack to an American post along the Rio Grande.
Taylor brought in fortifications, and-with the assistance of better rifles and gunnery was capable than overcome the Mexicans at the clashes of Palo Alto and Resaca de la Palma.
Following those fights, Polk told the U.S. Congress that the "Measure of avoidance has been depleted, even before Mexico passed the limit of the United States, attacked our region, and shed American blood upon American soil." after two days, on May 13, Congress announced war, in spite of restriction from some northern administrators.
No official assertion of war at any point originated from Mexico.
Around then, just around 75,000 Mexican natives lived north of the Rio Grande.
Therefore, U.S. powers drove by