The Southern states paid several prices for their inclusion in the United States. First, they had to agree to the Missouri Compromise of 1820, which prohibited slavery north of the 36°30' parallel. Second, they had to accept the Fugitive Slave Act of 1850, which required all citizens to assist in the return of escaped slaves. Third, they had to endure increasing tensions with the Northern states, which led to the American Civil War in 1861.
The American Civil War was a devastating conflict that resulted in the deaths of over 600,000 people. The war ended with the defeat of the Confederacy and the abolition of slavery. The Southern states were forced to rebuild their economies and societies after the war, and they faced many challenges in the years that followed.