They had lots of factories. For example in 1860, the North manufactured 97 percent of the country's firearms, 96 percent of its railroad locomotives, 94 percent of its cloth, 93 percent of its pig iron, and over 90 percent of its boots and shoes. The North had twice the density of railroads per square mile. This gave them an advantage. Hope this helps:) Stay Safe!!!
The author's point of view affects details and some parts of the event itself that the author doesn't want to include that don't prove their point or go against them.
