slavery and civil war timeline By jahki smith 1776 US declares independence 1803 Louisiana purchase 1820 Missouri compromise 1820 Underground railroad 1829 Trail of tears 1848 War with mexico 1849 Harriet tubman escapes 1850 Fugitive slave law 1857 Dred scott loses case 1858 Lincoln vs douglas debates 1860 lincoln elected president 1860 South Carolina secedes 1861 eleven southern states secedes