美国内战的原因的英文版..100个字就可以了，谢谢大家了

The American Civil War (1861–1865), also known as the War Between the States and several other names, was a civil war in the United States of America. Eleven Southern slave states declared their secession from the United States and formed the Confederate States of America (the Confederacy). Led by Jefferson Davis, they fought against the United States (the Union), which was supported by all the free states and the five border slave states. Union states were loosely referred to as "the North".
In the presidential election of 1860, the Republican Party, led by Abraham Lincoln, had campaigned against the expansion of slavery beyond the states in which it already existed. The Republican victory in that election resulted in seven Southern states declaring their secession from the Union even before Lincoln took office on March 4, 1861. Both the outgoing and incoming US administrations rejected the legality of secession, considering it rebellion.
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