Answer: A lot of factors.
Explanation: The north had nearly 21 million people while the south had claimed 9 million. The north also had a bigger industrial vantage. 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. There was not even one rifleworks in the entire South. All of the principal ingredients of GUNPOWDER were imported. Since the North controlled the navy, the seas were in the hands of the Union. A blockade could suffocate the South. Still, the Confederacy was not without resources and willpower.