The <em>Union</em> was confirmed by the most industrialized states in the country. This meant that the production of weapons and tools related to war logistics was controlled by them. Besides having more weapons and supplies, the <em>Union</em> also had more soldiers, as the population was considerably bigger in the north.
Railroads are a sign of development. In terms of war, they helped mobilize troops and resources along the country with relative ease in comparison to their <em>Confederate</em> counterparts. This represented a great advantage for the <em>Union</em>.
Besides having the previously mentioned advantages. The <em>Union</em> also had the naval power on their side and executed the blockade in an attempt to cut the resources from The <em>Confederacy</em>. As a response, the southern states replaced the growth of Cotton with other crops in order to have food supplies.
<span>Consensus history is a style of historiography that is mostly famous for American critics who emphasized the basic unity of American values. In addition, the also downplayed conflicts as superficial and lacking in complexity.</span>
He was a secretary of war for Roosevelt, professor of law at Yale, was part of the judicial branch, and got stuck in a bathtub :)
It's two of them, They were dependant on the USSR and They were neighboring states.
If you have to pick one, it's the first one I said.
