The Great John Ericsson (1937)

In 1803, Swedish inventor John Ericsson is born. After a military career he goes to England and becomes one of the first builders of locomotives. Despite large debts, he invents the propeller. In 1839 he crosses the Atlantic and builds ships for the US Navy. When the US Civil War breaks out, the Federation needs a ship to match the Confederate 'Merrimac' and preventing the Confederation from exporting cotton to Europe. Ericsson builds the 'Monitor', a ship the Federation needs to win the war.