Westward Expansion Timeline By Katelyn Jones Apr 21, 1791 Bill of Rights Apr 21, 1803 Louisiana Purchase Apr 21, 1804 Lewis and Clark Expedition Apr 21, 1806 End of Lewis and Clark Expedition Apr 21, 1819 Florida becomes US State Apr 21, 1830 Indian Removal Act Apr 21, 1838 Trail of Tears Apr 21, 1839 End of Trail of Tears Apr 21, 1846 Mexican-American War Apr 21, 1848 End Mexican-American War Apr 21, 1869 Transcontinental Railroad Completed