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At Every Hazard

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hat difference did it make whether any of the sources of Maria's river lay near the 50th parallel? Why was it so important that Meriwether Lewis was willing to risk his life in a region occupied by the "Pahkees" or Minnetares, the Assiniboines, and other people whom he had been led--by their enemies, of course--to believe were "vicious and illy disposed"?1
Thomas Jefferson's instructions had not included this plan. Indeed, the President had directed Lewis only to inquire into the southern sources of the Missouri, pointing out that "the Northern waters of the Missouri are less to be enquired after, becaue [sic] they have been ascertained to a considerable degree, & are still in a course of ascertainment by English traders, and travellers."2 The initial reports Lewis wrote to Jefferson after the expedition's return to St. Louis in late September of 1806 said nothing of his foray into Blackfeet territory, much less his own hairbreadth escape from death. 
Quicktime Movie | But in another letter, written to an unknown correspondent only six days later, Lewis explained his motive. He had decided to explore the northern tributaries of the Missouri River "at every hazard" in order to ascertain whether "some of it's Branches extended so far north as Lat 49° 37' N on the same parallel of Lat with the NW extremity of the Lake of the Woods, . . . believing it of the highest national importance as it respects our Treaty of 1783 with Great Britain."3--Joseph Mussulman 12/98; rev. 6/04 1. Lewis, May 10, 1805. He was here referring specifically to the Assiniboines. 2. Donald Jackson, ed., Letters of the Lewis and Clark Expedition with Related Documents, 1783–1854, 2nd ed., 2 vols. (Urbana: Uiversity of Illinois Press, 1978), 1:61–63. 3. Ibid., 1:341. In the spring of 1810, during his conversations with Nicholas Biddle preparatory to the latter's editing of the captains' journals, Clark reiterated that explanation. Ibid., 2:544.
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