The correct answer is A) American Civil War.
The military conflict that is most directly related to this passage is the American Civil War.
Austin Steward wrote the book "Twenty-two Years a Slave and Forty Years a Freeman." We are referring to an excerpt from his book.
The American Civil War started in 1861 and ended until 1865. It eas fought between the army of the Union, led by General Ulysses S. Grant and the army of the Confederated States, led by General Robert E. Lee. The Union won the war.
The other options of the question were B) American Revolution. C) Spanish-American War. D) Mexican American War.