D. Haiku
Haiku poems are only 3 lines
The significant advantage possessed by the Union at the beginning of the Civil War is a larger free population. They also have created big factories that can produce military supplies and ammunition. They have access to railways. This made transportation of men and supplies easier.
This term refers to a class of hereditary nobility in medieval Europe; a warrior class who shared a distinctive lifestyle based on the institution of knighthood, although there were social divisions within the group based on extremes of wealth.