Answer:
It greatly expanded on commercial opportunities, town construction along both lines, a faster route to markets for farm products, and other economic and industrial advancements all benefited from it. Several key financial bills were approved by Congress during the war that fundamentally changed the American monetary system.
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The Department of Homeland Security is responsible for securing U.S. Borders and ports.
This is in compliance to their vital mission, "to secure the nation from the many threats we face".