Reasons For Causing The Civil War What made America`s South and North fight against each other? What caused the Civil War? The Civil War started in 1861 when the slave states of the South founded the confederate states of America under President Jefferson Davis. The northern states, under President Abraham Lincoln, were against slavery. In 1865, the Union defeated the southern states. The biggest reason to cause Civil War included the economic disparity and the different opinion about slavery between South and North. The economic difference and different slave population were the primary reason to cause the Civil War. According to Document one and two, the Railroads map and the Resource of
