| 1231-1808: |  | | | Papal Inquisition from before birth until age 12 |
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| 1478-1834: | |
| 1760-1820: | | | | Reign of King George III (Hanover) from before birth until age 24 |
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| 1789-1796: | | | | George Washington selected 1st President from before birth until age 0 |
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| 1792-1815: | | | | Napoleonic war from before birth until age 19 |
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| 1796: | | | | Tennesee enters the union - 16th at age 0 |
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| 1796: | | | | France's presses get right of free speech at age 0 |
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| 1796: | | | | Vaccination against Smallpox at age 0 |
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| 1796-1800: | | | | John Adams elected 2nd president of US from age 0 to age 4 |
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| 1798-1800: | | | | Undeclared war with France from age 2 to age 4 |
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| 1798: | | | | US Marine Corps Established at age 2 |
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| 1798: | |
| 1798: | | | | Mississippi organized as a territory at age 2 |
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| 1799: | | | | Rosetta Stone found at age 3 |
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| 1800: | | | | Russia annexes Georgia at age 4 |
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| 1800: | | | | 1st Battery (Volta) at age 4 |
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| 1800-1809: | | | | Thomas Jefferson elected president of US from age 4 to age 13 |
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| 1800: | | | | US capital moves from Philadelphia to Washington DC at age 4 |
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| 1802: | | | | Babylonian cuniform deciphered at age 6 |
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| 1803: | | | | Ohio enters the union - 17th at age 7 |
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| 1803: | | | | Fulton propels vessel by steampower at age 7 |
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| 1803: | | | | Louisiana Territory Purchased at age 7 |
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| 1804-1806: | | | | Lewis and Clark Expedition from age 8 to age 10 |
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| 1804: | | | | Haiti independent - 1st black country in West. Hemis. at age 8 |
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| 1805: | | | | Thomas Jefferson re-elected president of US at age 9 |
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| 1805: | | | | Morphine isolated at age 9 |
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| 1807: | | | | Robert Fulton makes 1st practical steamboat voyage at age 11 |
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| 1808: | | | | Import of new slaves into US Is banned at age 12 |
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| 1808: | | | | Pompeii excavation begins in earnest at age 12 |
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| 1809-1816: | | | | James Madison elected president of US from age 13 to age 20 |
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| 1809: | | | | Charles Darwin born at age 13 |
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| 1810: | | | | US pop. reaches 7.2 million at age 14 |
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| 1810: | | | | Homeopathy founded at age 14 |
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| 1812: | | | | Missouri organized as a territory at age 16 |
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| 1812: | | | | Louisiana enters the union - 18th at age 16 |
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| 1812-1814: | | | | War of 1812 from age 16 to age 18 |
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| 1815: | | | | Sumbawa volcano (Indonesia) erupts; 50,000 killed at age 19 |
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| 1815: | | | | French outlaw slavery in France at age 19 |
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| 1815: | | | | Battle of Waterloo at age 19 |
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| 1816: | | | | Photographic Negative at age 20 |
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| 1816: | |
| 1816: | | | | Indiana enters the union - 19th at age 20 |
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| 1817: | | | | Pentrich Revolution - England's last revolution at age 21 |
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| 1817: | | | | Alabama organized as a territory at age 21 |
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| 1817-1823: | | | | 1st Cholera pandemic from age 21 to age 27 |
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| 1817-1825: | | | | Erie canal constructed from age 21 until after line end |
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| 1817: | | | | Mississippi enters the union - 20th at age 21 |
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| 1817-1824: | | | | James Monroe president of US from age 21 until after line end |
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| 1818: | | | | Illinois enters the union - 21st at age 22 |
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| 1818: | | | | Savannah 1st steamship to cross the Atlantic at age 22 |
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| 1819: | | | | Arkansas organized as a territory at age 23 |
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| 1819: | | | | Alabama enters the union - 22nd at age 23 |
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| 1819: | | | | Oersted discovers electro-magnetism at age 23 |
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| 1820-1830: | | | | Reign of King George IV (Hanover) from age 24 until after line end |
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| 1820: | | | | Maine enters the union - 23rd at age 24 |
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| 1821: | | | | Missouri enters the union - 24th at age 25 |
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| 1821-1829: | | | | Greek war of Independence from age 25 until after line end |
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| 1821: | | | | 1st US women's college at age 25 |
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| 1821: | | | | US pop. reaches 9.2 million at age 25 |
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| 1822: | | | | Florida organized as a territory at age 26 |
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