The term 'Side in the Civil War' refers to the two sides that fought in the American Civil War, which was fought between 1861 and 1865. The NORTH, also known as the UNION, was led by President Abraham Lincoln and was composed of the free states and five border states. The South, also known as the Confederacy, was led by President Jefferson Davis and was composed of eleven southern states that had seceded from the UNION. The crossword solution for the NORTH is 'UNION, ' which accurately describes the side in the Civil War.