What were the causes of the Mexican war and the effects ?!?!

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I think that back when the boarder line between the U.S and Mexico was up for debate the president at the time sent troops to to patrol what he thought was the boarder and Mexico sent troops then the U.S troops we're ether killed or missing and that was enough to start a war in the end Mexico lost and gave up Texas ,California and some other land . That's all I remember  

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