Answer:
Union: the action or fact of joining or being joined, especially in a political context.
Missouri Compromise: measure worked out between the North and the South and passed by the U.S. Congress that allowed for admission of Missouri as a slave state, Maine as a free state, and made free soil all western territories north of Missouri's southern border.
Confederacy: a league or alliance, especially of confederate states.
Habeas Corpus: a writ requiring a person under arrest to be brought before a judge or into court, especially to secure the person's release unless lawful grounds are shown for their detention.
Antietam: historic site in northwestern Maryland, on Antietam Creek, southeast of Sharpsburg, scene of a major Civil War battle in September 1862.
Ironclad: a 19th-century warship with armor plating
Reconstruction: the period 1865–77 following the Civil War, during which the states of the Confederacy were controlled by the federal government and social legislation, including the granting of new rights to African-Americans, was introduced
Reservation: an area of land set aside for occupation by North American Indians or Australian Aborigines.
