The American Civil War was fought between the United States and 11 Southern states that seceded from the Union. The primary cause of the war was the issue of slavery, which had become a moral, economic, and political issue in the country.

The Southern states believed that they had the right to secede from the Union and maintain their own economic and social systems, including slavery.

The war lasted from 1861 to 1865 and resulted in the Union's victory, the abolition of slavery, and the reunification of the country.

The war had a profound impact on the political, social, and economic developments of the United States. It led to the end of slavery and the beginning of Reconstruction, which aimed to rebuild the South and integrate former slaves into society. The war also strengthened the power of the federal government and established the principle of national supremacy over state sovereignty.
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