Era 4: 1801-1861
| DATE: | EVENT: |
| Mar. 4, 1801 | Thomas Jefferson is sworn in as the 3rd President of the United States. |
| Mar. 4, 1801 | Aaron Burr is sworn in as the 3rd Vice President of the Unted States. |
| Mar. 1, 1803 | Ohio is the 17th state admitted to the Union. |
| Apr. 30, 1803 | The United States purchases the Louisiana Territory for $15 million, containing what is now Arkansas, part of Colorado, Iowa, Louisiana, part of Minnesota, Missouri, part of Montana, part of North Dakota, part of Oklahoma, South Dakota, and part of Wyoming. |
| May 17, 1804 | Louis & Clark begin their expedition of the Louisiana Territory. |
| Mar. 4, 1805 | Thomas Jefferson is sworn in as President for a 2nd term. |
| Mar. 4, 1805 | George Clinton is sworn in as 4th Vice President of the United States. |
| Nov. 18, 1805 | Lewis and Clark reach the Pacific Ocean.
| Sep. 23, 1806 | Lewis and Clark return from exploring the Louisiana Territory. |
| Mar. 4, 1809 | James Madison is sworn in as the 4th President of the United States. |
| Mar. 4, 1809 | George Clinton is sworn in as Vice President for a 2nd term. |
| Oct. 27, 1810 | The United States annexes what is now part of Alabama, part of Louisiana, and part of Mississippi. |
| Apr. 30, 1812 | Louisiana is the 18th state admitted to the Union. |
| Jun. 18, 1812 | United States declares war on Britain. |
| Mar. 4, 1813 | James Madison is sworn in as President for a 2nd term. |
| Mar. 4, 1813 | Elbridge Gerry is sworn in as the 5th Vice President for a 2nd term. |
| Aug. 24, 1814 | The British set fire to Washington, D.C. |
| Sep. 20, 1814 | The Star-Spangled Banner becomes the official national Anthem. |
| Dec. 24, 1814 | The United States and Britain sign the Treaty of Ghent, ending the War of 1812. |
| Dec. 11, 1816 | Indiana is the 19th state admitted to the Union. |
| Mar. 4, 1817 | James Monroe is sworn in as the 5th President of the United States. |
| Mar. 4, 1817 | Elbridge Gerry is sworn in as Vice President for a 2nd term. |
| Dec. 10, 1817 | Mississippi is the 20th state admitted to the Union. |
| Dec. 3, 1818 | Illinois is the 21st state admitted to the Union. |
| Feb. 22, 1819 | The United States annexes Florida. |
| Dec. 14, 1819 | Alabama is the 22nd state admitted to the Union. |
| Mar. 15, 1820 | Maine is the 23rd state admitted to the Union. |
| Mar. 4, 1821 | James Monroe is sworn in as President for a 2nd term. |
| Mar. 4, 1821 | Daniel Tompkins is sworn in as the 6th Vice President of the United States. |
| Aug. 10, 1821 | Missouri is the 24th state admitted to the Union. |
| Mar. 4, 1825 | John Quincy Adams is sworn in as the 6th President of the United States. |
| Mar. 4, 1825 | John Calhoun is sworn in as the 7th Vice President of the United States. |
| Mar. 4, 1829 | Andrew Jackson is sworn in as the 7th President of the United States. |
| Mar. 4, 1829 | John Calhoun is sworn in as Vice President for a 2nd term. |
| Mar. 4, 1833 | Andrew Jackson is sworn in as President for a 2nd term. |
| Mar. 4, 1833 | Martin van Buren is sworn in as the 8th Vice President of the United States. |
| Jun. 30, 1834 | The Indian Territory is established in what is now Oklahoma. |
| Jun. 15, 1836 | Arkansas is the 25th state admitted to the Union. |
| Jan. 26, 1837 | Michigan is the 26th state admitted to the Union. |
| Mar. 4, 1837 | Martin van Buren is sworn in as the 8th President of the United States. |
| Mar. 4, 1837 | Richard Johnson is sworn in as the 9th Vice President of the United States. |
| Mar. 4, 1841 | William Harrison is sworn in as the 9th President of the United States. |
| Apr. 6, 1841 | John Tyler is sworn in as the 10th President of the United States. |
| Apr. 12, 1844 | The United States annexes what are now parts of Colorado, New Mexico, Kansas, Oklahoma, and Texas as a result of the Adams-Onis Treaty with Spain. |
| Mar. 3, 1845 | Florida is the 27th state admitted to the Union. |
| Mar. 4, 1845 | James Polk is sworn in as the 11th President of the United States. |
| Apr. 4, 1845 | George Dallas is sworn in as the 11th Vice President of the United States. |
| May 29, 1845 | Wisconsin is the 29th state admitted to the Union. |
| Dec. 29, 1845 | Texas is the 28th state admitted to the Union. |
| May 8, 1846 | The Mexican War begins with the Battle of Palo Alto. |
| May 13, 1846 | The United States declares war on Mexico. |
| Aug. 22, 1846 | The United States annexes what is now Arizona and New Mexico. |
| Dec. 28, 1846 | Iowa is the 30th state admitted to the Union. |
| Sep. 14, 1847 | American forces take Mexico City. |
| Feb. 2, 1848 | Mexico and the United States sign the treaty of Guadalupe Hidalgo, ending the Mexican-American War. |
| Feb. 2, 1848 | The United States gains what is now California, Nevada, Utah, and parts of Arizona, Colorado, New Mexico, and Wyoming as a result of the Treaty of Guadalupe Hidalgo. |
| Aug. 14, 1848 | The United States annexes the Oregon Territory containing what is now Idaho, part of Montana, Oregon, Washington, part of Wyoming. |
| Mar. 4, 1849 | Millard Filmore is sworn in as the 12th Vice President of the United States. |
| Mar. 5, 1849 | Zachary Taylor is sworn in as the 12th President of the United States. |
| Dec. 6, 1849 | Harriet Tubman escapes from slavery on the "Underground Railroad". |
| Jul. 10, 1850 | Millard Fillmore is sworn in as the 13th President of the United States. |
| Sep. 9, 1850 | California is the 31st state admitted to the Union. |
| Sep. 18, 1850 | The Fugitive Slave Act is passed by Congress, requiring the return of escaped slaves. |
| Mar. 4, 1853 | Franklin Pierce is sworn in as the 14th President of the United States. |
| Mar. 4, 1853 | William King is sworn in as the 13th Vice President of the United States. |
| Dec. 30, 1853 | The United States purchases what is now part of Arizona and New Mexico. |
| Mar. 4, 1857 | James Buchanan is sworn in as the 15th President of the United States. |
| Mar. 4, 1857 | John Breckinridge is sworn in as the 14th Vice President of the United States. |
| May 11, 1858 | Minnesota is the 32nd state admitted to the Union. |
| Feb. 14, 1859 | Oregon is the 33rd state admitted to the Union. |
| Dec. 20, 1860 | South Carolina is the 1st state to secede from the Union. |
| Jan. 29, 1861 | Kansas is the 34th state admitted to the Union. |
| Feb. 4, 1861 | The Confederate States of America is formed. |
| Feb. 4, 1861 | The Apache declare war on the United States. |
| Feb. 18, 1861 | Jefferson Davis is sworn in as the 1st President of the Confederate States of America |
| Feb. 18, 1861 | Alexander Stevens is sworn in as the 1st Vice President of the Confederate States of America. |
| Mar. 4, 1861 | Abraham Lincoln is sworn in as the 16th President of the United States. |
| Mar. 4, 1861 | Hannibal Hamlin is sworn in as the 15th Vice President of the United States. |
| Mar. 11, 1861 | The Confederate Congress adopts their Constitution. |
| Apr. 12, 1861 | Confederate forces begin an assault on Fort Sumter. |
| Apr. 13, 1861 | After 34 hours of bombardment, Fort Sumter surrenders. |
| Apr. 17, 1861 | Virginia is the 8th state to secede from the Union. |
| Apr. 19, 1861 | Union blockade of Confederate ports is initiated (1st part of the Anaconda Plan). |
| May 6, 1861 | President Abraham Lincoln declares a state of insurrection in the southern states. |
| May 21, 1861 | Richmond, VA. becomes the official capital city of the Confederate States. |
| Jul. 21, 1861 | Confederate forces win the 1st Battle of Bull Run. |
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