| 1800 | 1810 | 1820 | 1830 | 1840 | 1850 | 1860 | 1870 | 1880 | 1890 | 1900 | 1910 | 1920 | 1930 | 1940 | 1950 | 1960 | 1970 | 1980 | 1990 | 2000 | |
| World & Nation |
1803 |
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| State & Area | 1804,
August Lewis & Clark Camped north of Blair |
1819 Government established Fort Atkinson on the bluffs of the Missouri |
1827 |
1846 Mormon's temporary settlement at Winter Quarters outside present-day Omaha |
1855 |
1865,
April 1 |
1872 |
1896 County Seat assigned to Blair |
1920
Prohibition began in the U.S., which banned the sale of all alcoholic beverages. It was repealed in 1933 |
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| Railroad | 1857 Railroad track was laid as far as present Blair |
1886
Blair Railroad Bridge built |
1929 Abraham Lincoln Memorial Bridge (Auto Bridge) |
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| Congregational Church | 1870,
February 10 Congregational Church of Blair it organized 1874, Church Built |
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| Schools |
1871 Old Blair School Built |
1899 Blair High School |
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| Courthouse | 1889 Washington County Courthouse |
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| Crowell Mansion |
1884 Crowell Mansion Built |
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| Dana College |
1886 Trinity Seminary--Old Main (Central Structure) |
1893 Trinity Seminary --Old Main (North Wing) |
1904 Trinity Seminary --Old Main (South Wing) |
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Main Street |
1881
Blair Bank Building (Huber/Mathiesen Building) |
1890 Pilot Building |
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| Walker Avenue | 1901 Post Office |
1912 Fire Hall |
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Public & |
1916 Carnegie Library |
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| Residential | |||||||||||||||||||||
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Publications |
1894 Plat Book Published |