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Rh communicated his discovery, and gave a chart of the mouth of the river. This title of Gray to be regarded as the discoverer of the Columbia River was then, by this immediate publication of the discovery, made secure, and it has never been successfully questioned. The existence of such a river had long before been conjectured; others, before Gray, sailing along the coast had remarked the same indentation, had noted its latitude, and observed signs of fresh water issuing from it; but it remained for Gray to surmount the obstacles to entrance and actually to sail in and cast anchor in the river.

It was this discovery of the Columbia River by Robert Gray, a citizen of the United States, sailing under the American flag, and with the sanction of congress, that first gave the United States a claim to the Oregon region. It was not, however, to be the only ground of that claim. Some years before the discovery of the Columbia by Gray, an exploration of the Oregon region had been projected by Americans. The project seems to have originated with Jefferson, and may be regarded as a fitting prelude to the later achievement by his administration of the Louisiana Purchase. In the year 1786, six years before Gray's discovery, while Minister to France, Jefferson became acquainted with John Ledyard, of Connecticut, who had been with Captain Cook in his last voyage in the Pacific, and who as corporal of marines had gained some reputation for enterprise and daring. Ledyard had come to Paris in search of an opportunity to engage in the fur trade of the Pacific, and, failing in this, was ready to enlist in almost any other enterprise of daring. Jefferson suggested to him the exploration of the northwest region of America. The plan was, as Jefferson himself gives it, that Ledyard "go by land to Kamchatka, cross in Russian vessels to Nootka Sound, fall down into the latitude of the Missouri, and penetrate to and through