| 1478-1834: | |
| 1820-1830: |  |  |  | Reign of King George IV (Hanover) from before birth until age 4 |
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| 1821-1829: |  |  |  | Greek war of Independence from before birth until age 3 |
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| 1824-1828: |  |  |  | John Quincy Adams president of US from before birth until age 2 |
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| 1826: |  |  |  | 1st railroad tunnel (England) at age 0 |
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| 1827: |  |  |  | 1st Black newspaper Freedom's Journal at age 1 |
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| 1827: |  |  |  | Ohms Law formulated at age 1 |
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| 1827: |  |  |  | Ship's propeller (screw) at age 1 |
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| 1828: |  |  |  | 1st Webster's Dictionary at age 2 |
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| 1828: |  |  |  | 1st railroad in the US at age 2 |
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| 1828-1836: |  |  |  | Andrew Jackson president of US from age 2 to age 10 |
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| 1829: |  |  |  | 1st US patent on a typewriter at age 3 |
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| 1829-1851: |  |  |  | 2nd Cholera pandemic from age 3 until after line end |
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| 1830-1860: |  |  |  | Underground railroad leads 100,000+ slaves to freedom in US from age 4 until after line end |
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| 1830-1837: |  |  |  | Reign of King William IV (Hanover) from age 4 to age 11 |
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| 1830: |  |  |  | Mormons (Latter Day Saints) founded at age 4 |
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| 1832: |  |  |  | Horse-drawn trolleys in New York at age 6 |
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| 1833: | |
| 1833: |  |  |  | Slavery abolished in British Empire (home and colonies) at age 7 |
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| 1834: |  |  |  | Modern computer conceived by Charles Babbage at age 8 |
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| 1835: | |
| 1835-1842: |  |  |  | 2nd Seminole War from age 9 to age 16 |
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| 1835: |  |  |  | Mormon leader Joseph Smith prophesies of 'coming of lord' by 1891 at age 9 |
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| 1836: |  |  |  | Arkansas enters the union -25th at age 10 |
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| 1836: |  |  |  | Battle of the Alamo at age 10 |
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| 1836: |  |  |  | Texas war for independence from Mexico at age 10 |
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| 1837-1901: |  |  |  | Reign of Queen Victoria (Hanover) from age 11 until after line end |
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| 1837-1840: |  |  |  | Martin Van Buren president of US from age 11 to age 14 |
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| 1837: |  |  |  | Michigan enters the union - 26th at age 11 |
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| 1837: |  |  |  | Depression and Panic in the US - inflation, speculation at age 11 |
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| 1838-1839: |  |  |  | Forced relocation of Cherokee from age 12 to age 13 |
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| 1839-1842: |  |  |  | Opium war between China and the English from age 13 to age 16 |
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| 1841-1844: |  |  |  | John Tyler president of US from age 15 to age 18 |
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| 1842: |  |  |  | Chinese cede Hong Kong to the English at age 16 |
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| 1844: |  |  |  | 1st telegraph line message, Washington to New York at age 18 |
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