Timeline
Click on these links to learn more about the events surrounding the explorations.
 1800 - Jefferson elected President
1804-1806 - Lewis and Clark expedition
1803 - Louisiana Purchase
1806-1807 - Pike expedition
1812 - War of 1812
1819-1820 - Long expedition
1838 - Corps of Topographic Engineers created
1842-1846 - Frémont expeditions
1846-1848 - Mexican War
1846 - Emory expedition
1848-1855 - U.S.-Mexican Boundary Survey
1853-1854 - Pacific Railroad Survey
1861-1865 - Civil War
1867 - King expedition
1871-1879 - Wheeler expedition
1874 - Custer expedition
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