I am a very large farm where large amounts of crops are grown. What am I called?

I am the secret way enslaved Africans escaped to freedom in the North. What am I called?

My job was to help lead enslaved Africans, called passengers, to freedom on the Underground Railroad. What am I called?

I am an imaginary line between the states of Pennsylvania and Maryland, and I separate where slavery was allowed and where it was not. What am I called?

I was the group of northern states that thought it was wrong for the South to secede from the United States. What am I?

I was the group of southern states that seceded from the United States. What am I?

I am one of the main issues that caused the U.S. Civil War. What am I?

I was elected president because people in the North believed I would not allow slavery to expand. Who am I?

I am a group of stars that helped guide enslaved Africans to freedom. What am I?