Americans conquer a new frontier--the modern city--with Carnegie's empire of steel as its backbone. Skyscrapers and the Statue of Liberty are symbols of the American Dream for millions of immigrants. Urban life introduces a new breed of social ills, set against the backdrop of stunning skylines and ambitious innovations.

The attack on Pearl Harbor brings America into World War. The war effort revitalizes the nation's economy. American innovation and manufacturing might invigorate the Allies in Europe and in the Pacific, the ultimate piece of technology ends the war; a new global superpower takes the stage.