Events
| Lawmaking/Litigating | In Nashville, the Tennessee state house votes to ratify the Fourteenth Amendment. | 07/11/1866 |
| Lawmaking/Litigating | In Nashville, the Tennessee state senate votes fifteen to six to ratify the Fourteenth Amendment. | 07/11/1866 |
| Personal | Kansas Senator James Henry Lane dies from his self-inflicted wounds. | 07/11/1866 |
| Lawmaking/Litigating | Postmaster-General William Dennison resigns from the Johnson Cabinet over policy differences. | 07/11/1866 |
| Campaigns/Elections | The Democratic Party of Iowa meets in convention at Des Moines. | 07/11/1866 |
| 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 |