Vital factors that led to a Union victory in the Civil War

What were the vital factors that led to a Union victory in the Civil War?
Book :
The American Journey: A History of the United States, Volume 1
Goldfield, Abbott, Anderson, Argersinger, Barney, 2014
Pearson
ISBN.13: 978-0-205-96096-5
References :
Sources are listed in two places.
The first, a citation, is briefly listed within your answer. This includes identifying information that directs the
reader to your list of references at the end of your writing assignment.
The second, a reference, is at the end of your work in the list of references section.

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