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resolved most long standing border issues between the U.S. and British North America
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It fixed the western boundary of the Louisiana Purchase as beginning at the mouth of the Sabine River
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Polk was president when texas asked to become part of the US shortly after that mexico declared war on the US
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when the southwestern portion of the territory was admitted to the Union as the State of Oregon
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The treaty settled the dispute over the exact location of the Mexican border west of El Paso, Texas, giving the U.S. claim to approximately 29,600 square miles of land in what is now southern New Mexico and Arizona, for the price of $10 million.
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Mexico ceded to the U.S. in the Treaty of Guadalupe Hidalgo in 1848, but had not been part of the areas east of the Rio Grande which had been claimed by the Republic