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I was thinking after history class, why was The US so adamant at the southern border being at Rio Grande. I mean most of the disputed territory after the US annexed Texas was apart of New Mexico. Why was so valuable about controlling this border that they did not just take accept the original border of Texas during Spanish Mexico. They probably would have acquired the Baja peninsula if they took the border at the Nueces. Also, why was the US so forceful with Mexico? I mean Great Britain completely destroyed the US during the War of 1812 and they compromised quite a bit even though they basically won. Texas was willing to accept the border at the Nueces river so, why did Polk want the Rio grande so badly.
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