The Meixcan American was the war between Mexico and America over territory in the West, specifically California and New Mexico along with with Texas. This war was won by America and in result caused the President of Mexico to lose his presidency. A new Mexican government was brought up and made peace with the United States. This was the cause of a divide within the nation; it caused some to think that the war was "causeless, wicked, and unjust," while others accused the President at the time, Polk, that the war was to add more slave slates and allow "slave-owning Democrats" more control of the government--otherwise known as the Slave Power conspiracy. The divide within the nation helped lead to the Civil war in the way that the raised tensions were motive to start an argument, or even a war.