Birthdays
John Davenport Blackwell
Turns 44 on this date
Richard Montgomery Gano
Turns 36 on this date
John Henry Hobart Ward
Turns 43 on this date
Events
| Personal | In Detroit, Michigan, Democratic Party giant Lewis Cass dies at the age of eighty-three. | 06/17/1866 |
| 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 |
| Religion/Philosophy | The Primitive Methodist Church of the United States meets in Wisconsin at its annual conference. | 06/17/1866 |
| Battles/Soldiers | The United States Army begins its incursion into Native-American territory along the Bozeman Trail. | 06/17/1866 |