Answer:
Mississippi
Explanation:
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The Civil War, also known as “The War Between the States,” was fought between the United States of America and the Confederate States of America, a collection of eleven southern states that left the Union in 1860 and 1861 and formed their own country in order to protect the institution of slavery.
The second one is the answer
The key concept informs the reader
about the subject of the paragraph,
document, or other portion of a book.
The key concept is often expressed directly
in a declarative argument, which is a factual statement that ends in a period.