Hello,
The Mexican-American War (1846-1848) was caused by many factors.
Going back to 1836, one of the reasons was the Treaty of Velasco. The secret treaty had called for recognition of the Rio Grande as the border, and the release of Santa Anna. Since Santa Anna was not released immediately, the border was never officially established.
The Rio Grande border was another cause of the war. Mexico believed that the border was actually the Nueces River, about 200 miles north of the Rio Grande.
Texans, and the US claimed the Rio Grande as the border. The disputed land in between the two rivers is a rich farmland.
The final cause was Texas joining the United States in 1845. Mexico became alarmed that the US was out to grab all the land it could, and that Mexico would be it's next target.
Positive: We won the war and get many resources!
Negative: Lots of Deaths and resources used for it!
Plz mark me brainliest!
Hope this helps!
