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Mexico claimed the Nueces River as its northeastern border, and the U.S. claimed the Rio Grande River, then both troops met at the Rio Grande and the Mexican army fired.
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The battle took place north of the Rio Grande River close to present-day Brownsville, Texas, and was the first major battle of the Mexican-American War.
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The Battle of Resaca de la Palma was one of the battles early on in the Mexican-American war, and America won.
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The Battle of Mexico City was last battle of the Mexican-American War, and lasted two days.
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Mexico gave 1.36 million square kilometers (525,000 square miles) of its territory to the United States in exchange for $15 million US dollars. America also agreed to take over $3.25 million US dollars in debts Mexican owed to American Citizens.
