Robert Fulton
The first successful trial run of a steamboat had been made several years earlier in the United States by inventor John Fitch, on the Delaware River on August 22, 1787. Attendees included delegates from the Constitutional Convention, who were observing while taking a break from their summer-long sessions at Independence Hall. The steamboat was propelled by a bank of oars on either side of the boat. The following year Fitch launched a boat powered by a steam engine driving several stern-mounted oars. These oars paddled in a manner similar to the motion of a swimming duck's feet. With this boat he carried up to thirty passengers for hire on numerous round-trip voyages on the Delaware River between Philadelphia and Burlington, New Jersey.
Steamboats of the Mississippi
Steamboats on the Mississippi benefited from technology and political changes. The US bought the Louisiana Purchase from France in 1803. At the time, a semi-bankrupt Napoleon was attempting to extend his hegemony over Europe in what came to be known as the Napoleonic Wars. As a result, the US was then free to expand westward out of the Ohio valley and into the Great Plains and the Southwest.
The success of the "Charlotte Dundas" in Scotland in 1801 and Robert Fulton's "Clermont" on the Hudson River in 1807 proved the concept of the steamboat. At this time, walking beam mill engines, of the Boulton and Watt variety, were dropped onto wood barges with paddles to create an instant powerboat. The overhead engines of the "walking beam" type became the standard Atlantic Seaboard paddle engine for the next 80 years. For smaller boats, Watt perfected the side-lever engine with the engine cut down using side bell-cranks to lower the center of gravity. Sidewheel paddlers were the first to enter the scene. In 1811 the steamer "New Orleans" was built in Pittsburgh for Fulton and Livingston. Fulton started steamboat service between Natchez and New Orleans.