What Caused the Mexican-American War of 1846-48?

Here's the link to the first video:    • What Caused the Texas Revolution?  
Unlike typical depictions, the Mexican-American War was not simply American aggression. It, as every war is, was far more complicated than that, and there are no precise answers.
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Wiki: The Mexican–American War,[a] also known in the United States as the Mexican War and in Mexico as the Intervención estadounidense en México (United States intervention in Mexico),[b] was an armed conflict between the United States and Mexico from 1846 to 1848. It followed in the wake of the 1845 U.S. annexation of Texas, which was not formally recognized by the Mexican government, who disputed the Treaties of Velasco signed by Mexican caudillo President/General Antonio López de Santa Anna after the Texas Revolution a decade earlier. In 1845, newly elected U.S. President James K. Polk, who saw the annexation of Texas as the first step towards a further expansion of the United States,[5] sent troops to the disputed area and a diplomatic mission to Mexico. After Mexican forces attacked U.S. forces, the United States Congress declared war.
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Hashtags: #history #MexicanAmericanWar #causes
Mexico, Texas Revolution, Comanches, Texas, California, Apaches, New Mexico, Jackson, Manifest Destiny, James K. Polk, Polk, Santa Anna, Tyler, Nueces Strip, Taylor, Treaty of Guadalupe Hidalgo, Thornton Affair, Gadsden Purchase, Civil Disobedience, Thoreau, Abraham Lincoln, spot resolutions, Texas Republic, republic, Republic of the Rio Grande, annexation, Mexican-American War