The US Vessel Savannah was the first ship to cross the Atlantic using steam power (as well as sails). The Savannah was based out of Savannah, Georgia and cost around $50,000 to build. It’s transatlantic voyage started on May 22, 1819 and took over 29 days to reach Liverpool. On November 5, 1821, the Savannah was wreck after it ran aground by Long Island and was destroyed.
Smithsonian Institution, Timelines of History, New York: Dorling Kindersley, 2011, 275.