The Confederacy was defeated by the Union, and the rebel states were occupied by Union troops until 1877. The American Civil War is considered by several historians as the first modern war
Some things that helped the Union win were battleships used in war as well as submarines capable of destroying other ships. landmines and aquatic species have gained use in unprecedented numbers in the Western world. In addition, railroads, which had already been used in the Mexican-American and Crimean wars, were first mass-employed to move large numbers of soldiers from one region to another in a matter of a few days.
