| Term | Definition |
| 1763 | Treaty of Paris ends the French and Indian War |
| 1776 | Declaration of Independence |
| 1789 | Ratification of the Constitution |
| 1800 | Democratic-Republicans win the presidency and control of Congress during the "Revolution of 1800" |
| 1803 | Louisiana Purchase and the Supreme Court decision of Marbury v. Madison |
| 1814 | Treaty of Ghent ends the War of 1812 |
| 1848 | Treaty of Guadelupe-Hidalgo ends the Mexican War and gives the US control of the Mexican Cession |
| 1861 | Outbreak of the Civil War |
| 1865 | End of the Civil War and the death of Abraham Lincoln |
| 1877 | Hayes withdraws last Union troops from the South and officially ends Reconstruction |
| 1914 | Outbreak of WWI in Europe |
| 1919 | Treaty of Versailles |
| 1929 | Stock Market Crash of 1929 |
| 1941 | Japanese attack Pearl Harbor and US enters WWII. |
| 1945 | WWII ends, Atomic Age begins, creation of the United Nations, Cold War, and the beginning of the end for colonialism |
| 1954 | US enters Vietnam and the Supreme Court case of Brown v. Board of Education |
| 1960 | First sit-ins in Greensboro, North Carolina and the election of JFK |
| 1964 | Civil Rights Act is passed |
| 1968 | Assassination of Martin Luther King Jr. and Robert F. Kennedy end the Civil Rights Movement |
| 1973 | Paris Peace Agreement and the War-Powers Resolution |
| 1989 | Dismantling of the Berlin Wall, the election of Solidarity in Poland, and the fall of the Eastern European economies signal the collapse of the Soviet Union |
| 1994 | Republican landslide victories give them control of both houses of Congress |