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| Millennium |
| 2nd millennium |
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| 1868 by topic |
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| Arts, history, and science |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
1868 (MDCCCLXVIII) was a leap year starting on Wednesday in the Gregorian calendar and a leap year starting on Monday in the Julian calendar.
Deaths
June 1 - James Buchanan, 77, fifteenth President of the United States, respiratory failure (b. 1791)