Island Number Ten defends a mighty double bend in the Mississippi, but it is no match for Admiral Foote's ironclads and General Pope's Army of the Mississippi as they steamroll their way south!
The twin victories at Fort Henry and Donelson opened up the Confederacy to raids deep in their territory and allowed Grant to throw the South on the defense in the Western theeater for the rest of the war.
In the early 20th century the US became a global power under President Roosevelt. Expanding the fleet, building the Panama Canal, and shifting from isolationism, by World War I, the U.S. was a major power, witnessing the epic Battle of Jutland and German submarine warfare against a starving Britain.
United States beats Spain in the Spanish American War and emerges onto the world stage as a great power, with colonies and a navy to match our newfound status. This post also touches on the changes the navy went through during this period.