Geography and the Environment By mirellemahmoud 1620 Tobacco Boom 1676 Bacon's Rebellion 1763 Proclamation of 1763 1800 Washington becomes Capital 1803 Louisiana Purchase 1803 Lewis and Clark Expedition 1820 Missouri Compromise 1849 California Gold Rush 1862 Homestead Act 1864 Yosemite National Park 1872 Yellowstone National Park 1891 Forest Reserve Act 1893 Frontier Thesis 1897 Forest Management Act 1930 Dust Bowls 1945 Hiroshima Atomic Bombing 1962 Silent Spring Written 1963 Clean Air Act 1972 Clean Water Act 1973 Endangered Species Act