| 1478-1834: | |
| 1820-1830: |  | | | Reign of King George IV (Hanover) from before birth until age 3 |
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| 1821-1829: | | | | Greek war of Independence from before birth until age 2 |
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| 1824-1828: | | | | John Quincy Adams president of US from before birth until age 1 |
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| 1827: | | | | 1st Black newspaper Freedom's Journal at age 0 |
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| 1827: | | | | Ohms Law formulated at age 0 |
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| 1827: | | | | Ship's propeller (screw) at age 0 |
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| 1828-1836: | | | | Andrew Jackson president of US from age 1 to age 9 |
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| 1828: | | | | 1st railroad in the US at age 1 |
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| 1828: | | | | 1st Webster's Dictionary at age 1 |
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| 1829: | | | | 1st US patent on a typewriter at age 2 |
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| 1829-1851: | | | | 2nd Cholera pandemic from age 2 to age 24 |
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| 1830-1860: | | | | Underground railroad leads 100,000+ slaves to freedom in US from age 3 until after line end |
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| 1830: | | | | Mormons (Latter Day Saints) founded at age 3 |
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| 1830-1837: | | | | Reign of King William IV (Hanover) from age 3 to age 10 |
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| 1832: | | | | Horse-drawn trolleys in New York at age 5 |
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| 1833: | | | | Slavery abolished in British Empire (home and colonies) at age 6 |
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| 1833: | |
| 1834: | | | | Modern computer conceived by Charles Babbage at age 7 |
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| 1835-1842: | | | | 2nd Seminole War from age 8 to age 15 |
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| 1835: | |
| 1835: | | | | Mormon leader Joseph Smith prophesies of 'coming of lord' by 1891 at age 8 |
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| 1836: | | | | Texas war for independence from Mexico at age 9 |
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| 1836: | | | | Arkansas enters the union -25th at age 9 |
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| 1836: | | | | Battle of the Alamo at age 9 |
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| 1837-1901: | | | | Reign of Queen Victoria (Hanover) from age 10 until after line end |
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| 1837-1840: | | | | Martin Van Buren president of US from age 10 to age 13 |
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| 1837: | | | | Depression and Panic in the US - inflation, speculation at age 10 |
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| 1837: | | | | Michigan enters the union - 26th at age 10 |
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| 1838-1839: | | | | Forced relocation of Cherokee from age 11 to age 12 |
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| 1839-1842: | | | | Opium war between China and the English from age 12 to age 15 |
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| 1841-1844: | | | | John Tyler president of US from age 14 to age 17 |
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| 1842: | | | | Chinese cede Hong Kong to the English at age 15 |
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| 1844: | | | | 1st telegraph line message, Washington to New York at age 17 |
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| 1845-1848: | | | | James K Polk president of US from age 18 to age 21 |
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| 1845-1849: | | | | Irish Potato Famine from age 18 to age 22 |
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| 1845: | | | | Texas enters the union - 28th at age 18 |
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| 1845: | | | | Florida enters the union - 27th at age 18 |
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| 1846: | | | | Iowa enters the union - 29th at age 19 |
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| 1846-1848: | | | | The Mexican-US War from age 19 to age 21 |
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| 1848: | | | | Oregon organized as a territory at age 21 |
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| 1848: | | | | NY allows women to own real estate at age 21 |
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| 1848-1856: | | | | 1st gold rush in California -- Sutters Mill from age 21 until after line end |
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| 1848: | | | | Wisconsin enters the union - 30th at age 21 |
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| 1849: | | | | Fizeau measures speed of light at age 22 |
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| 1849-1852: | | | | Zachary Taylor president of the US from age 22 to age 25 |
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| 1850: | | | | US pop reaches 23 million at age 23 |
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| 1850: | | | | World pop. est. at 1.1 billion at age 23 |
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| 1850: | | | | New Mexico organized as a territory at age 23 |
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| 1850: | | | | California enters the union - 31st at age 23 |
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| 1850: | | | | Utah (included Nevada) organized as a territory at age 23 |
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| 1851: | | | | Gold rush in Australia at age 24 |
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| 1852-1859: | | | | 3rd Cholera pandemic from age 25 until after line end |
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| 1853-1856: | | | | Franklin Pierce president of US from age 26 until after line end |
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| 1853: | | | | Washington (included pt. of Idaho) organized as a territory at age 26 |
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| 1854: | | | | Nebraska organized as a territory at age 27 |
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| 1854-1856: | | | | Crimean War from age 27 until after line end |
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| 1854: | | | | Kansas organized as a territory at age 27 |
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