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President Polk sent Sidel to Mexico to buy New Mexico and California. President Herrera refused to negotiate with Sidel.
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after being an independent republic for several years. It applied for admission to the United States as a state.
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Congress approved the declaration of war with southern Democrats in strong support.
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Mexico's number of troops were outnumbered andmany of its large cities was occupied,so they could not defend itself and had little choice but to make peace on any terms.
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followed by a three-day negotiation, on 29 March, the Mexicans officially surrendered (before it, US rejected the Mexican's plead of letting children and women out of the city).
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The treaty provided for the Mexican Cession of 1.36 million km² in exchange for 15 million dollars. The Treaty also ceded an additional 1,007,935 km² (Texas)