Lewis and Clark timeline By Shiomara Apr 30, 1803 France sells 828,000 square miles of miles of land West of the Mississippi River to the United States (Louisiana Purchase) Jun 18, 1803 Jefferson secretly requuests approval from Congress for expedition Jul 4, 1803 Jefferson announces the Louisiana Purchase Jun 13, 1805 Expedition reaches the Great Falls of the Missouri River near what is now Great Falls,Montana Aug 17, 1805 Sacagawea meets the Shoshone chief,her long-lost brother Sep 13, 1806 Return to St. Louis;journey complete
