| Bonus Army | 1932-05/1932-07-28 | — |
| Boston Tea Party | 1773-12-16 | — |
| Brown v. Board of Education | 1954-05-17 | — |
| Columbian Exchange | 1492/.. | — |
| Columbus’s First Voyage | 1492-08-03/1493-03-15 | — |
| Constitutional Convention | 1787-05-25/1787-09-17 | — |
| Declaration of Independence | 1776-07-04 | — |
| Dred Scott Decision | 1857-03-06 | — |
| Election of 1800 | 1800-10-31/1801-02-17 | — |
| Election of 1896 | 1896-11-03 | — |
| Emancipation Proclamation | 1863-01-01 | — |
| Opening of the Erie Canal | 1825-10-26 | — |
| Fall of the Berlin Wall | 1989-11-09 | — |
| French and Indian War | 1754-05-28/1763-02-10 | — |
| Great Migration | 1910/1970 | — |
| Homestead Strike | 1892-06-30/1892-11-20 | — |
| King Philip’s War | 1675-06-20/1676-08-12 | — |
| Mexican-American War | 1846-04-25/1848-02-02 | — |
| Nat Turner’s Rebellion | 1831-08-21/1831-08-23 | — |
| Attack on Pearl Harbor | 1941-12-07 | — |
| Passage of the (First) Reconstruction Act | 1867-03-02 | — |
| The Reconstruction Era | 1865/1877 | — |
| Red Summer | 1919-04/1919-11 | — |
| Seneca Falls Convention | 1848-07-19/1848-07-20 | — |
| September 11 Attacks | 2001-09-11 | — |
| Social Security Act | 1935-08-14 | — |
| Spanish-American War | 1898-04-21/1898-08-12 | — |
| Trail of Tears | 1838/1839 | — |
| Triangle Shirtwaist Factory Fire | 1911-03-25 | — |
| Tulsa Race Massacre | 1921-05-31/1921-06-01 | — |
| Voting Rights Act | 1965-08-06 | — |
| Watergate Scandal | 1972-06-17/1974-08-09 | — |
| Wounded Knee Massacre | 1890-12-29 | — |