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.
Missouri River
Boat travel on the Missouri started with the wood-framed canoes and bull boats of the Native Americans, which were used for thousands of years before the introduction of larger craft to the river upon colonization of the Great Plains. The first steamboat on the Missouri was the "Independence", which started running between St. Louis and Keytesville, Missouri around 1819. By the 1830s, large mail and freight-carrying vessels were running regularly between Kansas City and St. Louis, and many traveled even farther upstream. A handful, such as the "Western Engineer" and the "Yellowstone", were able to make it up the river as far as eastern Montana.