| 1829-1851: | |  |  |  | 2nd Cholera pandemic  from before birth until age 9 | 
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  | 1830-1860: | |  |  |  | Underground railroad leads 100,000+ slaves to freedom in US  from before birth until after line end | 
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  | 1835-1842: | |  |  |  | 2nd Seminole War  from before birth until age 0 | 
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  | 1837-1901: | |  |  |  | Reign of Queen Victoria (Hanover)  from before birth until after line end | 
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  | 1839-1842: | |  |  |  | Opium war between China and the English  from before birth until age 0 | 
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  | 1841-1844: | |  |  |  | John Tyler president of US  from before birth until age 2 | 
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  | 1842: | |  |  |  | Chinese cede Hong Kong to the English  at age 0 | 
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  | 1844: | |  |  |  | 1st telegraph line message, Washington to New York  at age 2 | 
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  | 1845-1848: | |  |  |  | James K Polk president of US  from age 3 to age  6 | 
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  | 1845-1849: | |  |  |  | Irish Potato Famine  from age 3 to age  7 | 
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  | 1845: | |  |  |  | Florida enters the union - 27th  at age 3 | 
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  | 1845: | |  |  |  | Texas enters the union - 28th  at age 3 | 
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  | 1846-1848: | |  |  |  | The Mexican-US War  from age 4 to age  6 | 
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  | 1846: | |  |  |  | Iowa enters the union - 29th  at age 4 | 
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  | 1848-1856: | |  |  |  | 1st gold rush in California -- Sutters Mill  from age 6 until after line end | 
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  | 1848: | |  |  |  | Wisconsin enters the union - 30th  at age 6 | 
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  | 1848: | |  |  |  | NY allows women to own real estate  at age 6 | 
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  | 1848: | |  |  |  | Oregon organized as a territory  at age 6 | 
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  | 1849-1852: | |  |  |  | Zachary Taylor president of the US  from age 7 to age  10 | 
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  | 1849: | |  |  |  | Fizeau measures speed of light  at age 7 | 
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  | 1850: | |  |  |  | US pop reaches 23 million  at age 8 | 
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  | 1850: | |  |  |  | New Mexico organized as a territory  at age 8 | 
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  | 1850: | |  |  |  | World pop. est. at 1.1 billion  at age 8 | 
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  | 1850: | |  |  |  | California enters the union - 31st  at age 8 | 
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  | 1850: | |  |  |  | Utah (included Nevada) organized as a territory  at age 8 | 
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  | 1851: | |  |  |  | Gold rush in Australia  at age 9 | 
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  | 1852-1859: | |  |  |  | 3rd Cholera pandemic  from age 10 until after line end | 
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  | 1853-1856: | |  |  |  | Franklin Pierce president of US  from age 11 until after line end | 
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  | 1853: | |  |  |  | Washington (included pt. of Idaho) organized as a territory  at age 11 | 
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  | 1854-1856: | |  |  |  | Crimean War  from age 12 until after line end | 
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  | 1854: | |  |  |  | Kansas  organized as a territory  at age 12 | 
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  | 1854: | |  |  |  | Nebraska organized as a territory  at age 12 | 
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