Answer:
The main advantage held by the North over the South at the start of the Civil War was that "It had a far more extensive network of railroads and telegraph lines".
Explanation:
The Roman Empire built its capacity early on by seeking to control the Mediterranean.
Answer:
The Underground Railroad was a network of people, African American as well as white, offering shelter and aid to escaped slaves from the South. It developed as a convergence of several different clandestine efforts. The exact dates of its existence are not known, but it operated from the late 18th century to the Civil War, at which point its efforts continued to undermine the Confederacy in a less-secretive fashion.
Explanation: