1800-1876 By JeffLink 1804 Lewis and Clark explore America 1820 Missouri Compromise 1823 Monroe Doctrine begins 1825 Erie Canal Completed 1830 Second Great Awakening begins 1830 Indian Removal Act 1836 Texas declares independence 1848 California Gold Rush 1858 Lincoln Douglas debates 1860 Secession and the Civil War begins 1865 Assassination of Lincoln