| 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: | |  |  |  | Michigan enters the union - 26th  at age 10 | 
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  | 1837: | |  |  |  | Depression and Panic in the US - inflation, speculation  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: | |  |  |  | Texas enters the union - 28th  at age 18 | 
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  | 1845-1849: | |  |  |  | Irish Potato Famine  from age 18 to age  22 | 
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  | 1845: | |  |  |  | Florida enters the union - 27th  at age 18 | 
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  | 1845-1848: | |  |  |  | James K Polk president of US  from age 18 to age  21 | 
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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: | |  |  |  | Wisconsin enters the union - 30th  at 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 to age  29 | 
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  | 1849-1852: | |  |  |  | Zachary Taylor president of the US  from age 22 to age  25 | 
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  | 1849: | |  |  |  | Fizeau measures speed of light  at age 22 | 
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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: | |  |  |  | US pop reaches 23 million  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 to age  29 | 
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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 to age  29 | 
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  | 1854: | |  |  |  | Kansas  organized as a territory  at age 27 | 
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  | 1857-1860: | |  |  |  | James Buchanan president of US  from age 30 until after line end | 
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  | 1857-1866: | |  |  |  | Transatlantic cable laid  from age 30 until after line end | 
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  | 1857: | |  |  |  | Dred Scott decision: Blacks could not be US citizens  at age 30 | 
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