The correct answer is B, the National Road.
The National Road was the first major managed road in the United States built by the federal government. Carried out between 1811 and 1837, the 1,000-kilometer route connected the Potomac and the Ohio River and was one of the western tracks for thousands of settlers.
Construction began westward in 1811 at Cumberland, Maryland, on the Potomac River. After the financial panic of 1837 and the ensuing economic depression, funds from Congress were dry and construction was halted in Vandalia, Illinois.
Old immigrants were people who immigranted generally from Europe, for example, Britain or Germany.
New immigrants were people generally from Asia and the Pacific, for example, China, Japan, etc.
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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.
