Maine, New York, New Hampshire, Vermont and Massachusetts are some Union states. The Union refers to the 20 free states and the five border slave states during the American Civil War.
The Union states had a large urbanized and industrialized area and advanced commercial, transportation and financial systems. The population was 18.5 million, and 48 percent of the population was made up of farmers. The Union had 101,000 factories, 1.1 million factory workers and 20,000 miles of railroad. During the Civil War, the Union had 2,489,836 white soldiers, 178,975 African American soldiers and 3,530 Native American soldiers, which made a total enlistment of 2,672,341.