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zyx jammin on acoustic for real The Louisiana Purchase treaty did not define where the exact boundaries of the new territory were. The only boundaries the French recognized were those existing when Spain gave them the colony, and these were very uncertain. Louisiana was a huge land mass, and no one knew for sure just how far it reached. This opened the door for new exploration and settlement. In order to claim its new territory with authority, the United States first had to explore and then populate it. President Jefferson commissioned Meriwether Lewis and William Clark to head the first transcontinental expedition. In May 1804, once the transfer of Louisiana to the United States was official, Lewis and Clark departed from the St. Louis area with some forty enlisted soldiers. Their journey up the Missouri River, into uncharted lands, across the Great Divide, and along the Columbia River to the Pacific Ocean took over a year. They returned to St. Louis in September 1806. Meriwether Lewis C. W. Peale 1807 President Jefferson appointed Lewis as governor of Upper Louisiana after the success of his transcontinental expedition with William Clark. The Lewis and Clark expedition was the first government-sponsored scientific enterprise in the United States. It was America's first attempt to evaluate the environment of the Great Plains, the breadth of the Rockies, and the nature and extent of the terrain west of the Continental Divide. Geographical discoveries made by Lewis and Clark and recorded in their journals vastly expanded American knowledge of the new territory and helped promote trade and settlement in the region. Other explorers, including Zebulon Pike, William Dunbar, and George Hunter explored other important river regions in the new Louisiana territory to add to Lewis's and Clark's discoveries.