"United States" . . . . "West (U.S.)" . . "Lewis and Clark Expedition (1804-1806)" . . . . . . . . . . "Letter : to the House of Representatives"@en . . . . . . . . . . "President John Quincy Adams asks Congress whether Jefferson's message should continue to be kept confidential. Jefferson's message recommends an exploring expedition across the American continent."@en .