Causes: Border disputes: Mexico wanted the Southern boundary at the Nueces River and the U.S. wanted it at the Rio Grande., Texas annexation by the U.S. , manifest destiny: U.S. wanted to expand to the Pacific Ocean, "American blood was shed on American soil." , Effects: The Rio Grande became the official border., U.S. gained the Mexican Cession including California, Nevada, Arizona and parts of other states as well. , U.S. paid Mexico $15 million dollars for the Mexican Cession.,

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