Final answer:
Southern states seceded because they feared the Republicans would abolish slavery.
Step-by-step explanation:
The subject of your question is History. Specifically, it pertains to the reasons why Southern states seceded during a certain period in history.
Southern states seceded from the United States because they feared that the newly elected Republican government would abolish slavery, which was a vital part of their economy and social structure. They believed that the Republicans would force them to accept anti-slavery policies.
It is important to note that the reasons for secession were complex and varied among different states, but the fear of losing slavery played a significant role. Other factors, such as political differences and states' rights, also contributed to the decision to secede.
Learn more about Secession in Southern states