The Rio Grande is a river that forms part of the border between Mexico and Texas. It was central to boundary disputes during the Mexican-American War.
Think of Rio Grande as a long fence separating two neighbors' yards (Mexico and Texas). Disputes arise when one neighbor claims more yard space than what was originally agreed upon.
Treaty of Guadalupe Hidalgo: This treaty ended the Mexican-American War in 1848, with Mexico recognizing U.S. sovereignty over Texas - with Rio Grande as its southernmost border.
Zachary Taylor: A U.S. military leader who defended disputed territory near the Rio Grande during the onset of the Mexican-American War; later became President.
Border Dispute: A disagreement over where one country's land ends and another's begins; often leads to conflict or war, like it did between Mexico and America over Texas.
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