| 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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