Military History Period 3 American Civil War There are many reasons why the United States had a Civil War, but what caused the war to actually start? Slavery, the expansion of the western side, and the dispute between state laws and federal laws all played a major part in the separation between the North and the South. In 1860, when Abraham Lincoln was elected president and it caused seven southern states to succeed from the union including: Texas, Mississippi, Alabama, Georgia, Florida…
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