1. 1776: Declaration of Independence
2. 1781: Articles of Confederation
3. 1789: Constitution of the United States
4. 1803: Louisiana Purchase
5. 1812: War of 1812
6. 1846: Mexican-American War
7. 1861: American Civil War
8. 1898: Spanish-American War
9. 1917: World War I
10. 1929: Great Depression
11. 1941: World War II
12. 1950: Korean War
13. 1964: Civil Rights Act of 1964
14. 1969: Apollo 11 Moon landing
15. 1973: Watergate scandal
16. 1989: Fall of the Berlin Wall
17. 1991: Persian Gulf War
18. 2001: September 11 attacks
19. 2003: Iraq War
20. 2008: Great Recession
21. 2011: Osama bin Laden killed
22. 2015: Same-sex marriage legalized
23. 2016: Donald Trump elected President
24. 2020: COVID-19 pandemic