The task of constructing a great inland river marine to play the dual rôle of serving the cotton empire and of extending American migration and commerce into the trans-Mississippi region was solved by Henry Shreve when he built the Washington at Wheeling in 1816. Shreve was the American John Hawkins. Hawkins, that sturdy old admiral of Elizabethan days, took the English ship of his time, trimmed down the high stern and poop decks, and cut away the deep-lying prow and stern, after the fashion of our modern cup defenders, and in a day gave England the key to sea mastery in the shape of a new ship that would take sail and answer her rudder beyond anything the maritime world until then had known. Shreve, like Hawkins, flagrantly ignoring the conventional wisdom of his day and craft, built the Washington to sail on the water instead of in it, doing away altogether with a hold and supplying an upper deck in its place. To few inventors, indeed, does America owe a greater debt of thanks than to this Ohio River shipbuilder. A dozen men were on the way to produce a Clermont had Fulton failed; but Shreve had no rival in his plan to build a flat-bottomed steamboat. The remarkable success of his design is attested by the fact that in two decades the boats built on his model outweighed in tonnage all the ships of the Atlantic seaboard and Great Lakes combined. Immediately the Ohio became in effect the western extension of the great national highway and opened an easy pathway for immigration to the eastern as well as the western lands of the Mississippi Basin. The story goes that an old phlegmatic negro watched the approach of one of the first steamboats to the wharf of a Southern city. Like many others, he had doubted the practicability of this new-fangled Yankee notion. The boat, however, came and went with ease and dispatch. The old negro was converted. "By golly," he shouted, waving his cap, "the Mississippi's got her Massa now." The Mississippi had indeed found her master, but only by slow degrees and after intervals of protracted rebellion did she succumb to that master. Luckily, however, there was at hand an army of unusual men--the "alligator-horses" of the flatboat era--upon whom the steamboat could call with supreme confidence that they would not fail. Theodore Roosevelt has said of the Western pioneers that they "had to be good and strong--especially, strong." If these men upon whom the success of the steamboat depended were not always good, they were beyond any doubt behemoths in strength.