Birthdays
Henry Bowen Anthony
Turns 51 on this date
Simon Bolivar Buckner
Turns 43 on this date
John Egbert Farnum
Turns 42 on this date
Jeremiah Haralson
Turns 20 on this date
James Wilson Troxell
Turns 35 on this date
James Williams
Turns 41 on this date
Richard Wootton
Turns 31 on this date
Theodore George Wormley
Turns 40 on this date
Events
| Religion/Philosophy | Easter Sunday | 04/01/1866 |
| Legal/Political | The first session of the 39th Congress is sitting in Washington DC from early January to late July, 1866 |
01/07/1866 to 07/27/1866 |
| Business/Industry | Western Union absorbs US Telegraph and takes control of virtually all the American telegraph industry | 04/01/1866 |