Birthdays
George Armstrong Custer
Turns 26 on this date
James Guthrie
Turns 73 on this date
John Baldwin Raymond
Turns 21 on this date
Events
| Campaigns/Elections | City Recorder John Thompson Hoffman, a Democrat, is elected the Mayor of New York City | 12/05/1865 |
| US/the World | Peru and Chile negotiate an alliance against Spain, assuring full-scale war over the Chincha Islands dispute | 12/05/1865 |
| Legal/Political | The first session of the 39th Congress is sitting at the capital from December 4 to December 21, 1865 |
12/05/1865 to 12/19/1865 |