Wasn't built, It was Pangea, the Super Continent that broke into All Continents throught the Millions Of years, The Theory of Continential Drift.
The U.S. was built by the hard work of the Fouding...
America's first steamboat was built by John Fitch when Fitch tried to open his own ferry business he failed. But Robert Fulton took up the idea and started his own business and succeeded.