As a matter of record, it may be said here that the actual transfer of the lower part of the territory--commonly known as Orleans--took place at New Orleans, December 20, 1803, and the transfer of the upper part was effected at St.Louis, March 10, 1804, before the Lewis and Clark expedition had started on its long journey to the northwestward.
All over the small area of the United States then existed a deep interest in the proposed explorations of the course and sources of the Missouri River.

The explorers were about to plunge into vast solitudes of which white people knew less than we know now about the North Polar country.

Wild and extravagant stories of what was to be seen in those trackless regions were circulated in the States.

For example, it was said that Lewis and Clark expected to find the mammoth of prehistoric times still living and wandering in the Upper Missouri region; and it was commonly reported that somewhere, a thousand miles or so up the river, was a solid mountain of rock salt, eighty miles long and forty-five miles wide, destitute of vegetation and glittering in the sun! These, and other tales like these, were said to be believed and doted upon by the great Jefferson himself.

The Federalists, or "Feds," as they were called, who hated Jefferson, pretended to believe that he had invented some of these foolish yarns, hoping thereby to make his Louisiana purchase more popular in the Republic.
In his last letter to Captain Lewis, which was to reach the explorers before they started, Jefferson said: "The acquisition of the country through which you are to pass has inspired the country generally with a great deal of interest in your enterprise.