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came about for many reasons. Among them, probably the biggest, was the Mexican war. This war was mainly about the U.S. trying to gain more spanish territory to complete its manifest destiny. President Polk had been eager to compromise with britian on the ....

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.... the Mexicans refused so Polk decided that he had no other alternative then to use force. Polk ordered Zachary Taylor to move his troops from the nuces to the rio grande and to build a fort to blockade the river. To mexico this was an invasion of their territory. Mexican troops therefor crossed the rio grande and in a small battle wounded sixteen American soldiers. This was the Beginning Spark of war. The Mexican people were more united about the war then the americans were. Mexicans felt that they were defending thier territory against invaders. In the United States the war was popular in both the south and the west. Where expansio ....