The river disputed was whether it was the Rio Nueces or Rio Grande that was the border.
There was no "dispute" though according to the treaty signed by Santa Anna himself. The treaty specifically stated the Rio Grande, him being pissed about the treaty later didnt give him the right to invade soverign soil of Texas or United States. Say what you will about the rest of the war and the massive landgrab that ensued, but the starting of the war was legit.
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