Birthdays
Cyrus Kurtz Holliday
Turns 34 on this date
John Henry Kauffman
Turns 34 on this date
John Gill Shorter
Turns 42 on this date
William Magear Tweed
Turns 37 on this date
Charles Wilkes
Turns 62 on this date
Events
| Foreign | Carlist forces land in Catalonia and declare the pretender Don Carlos as rightful King of Spain | 04/03/1860 |
| US/the World | In Arizona, an unauthorized convention meets to form a provisional government |
04/02/1860 to 04/05/1860 |
| Lawmaking/Litigating | Local officials foil U.S. Senate attempt to arrest Frank Sanborn for failure to appear to testify on Harpers Ferry | 04/03/1860 |
| Foreign | Pretoria becomes capital of the South African Republic | 04/03/1860 |
| Lawmaking/Litigating | The 36th U.S. Congress is in session in Washington, D.C. |
12/06/1859 to 06/24/1860 |
| US/the World | The first Japanese diplomatic mission to the United States hosted in San Francisco |
03/31/1860 to 04/06/1860 |
| Business/Industry | The Pony Express begins its first run | 04/03/1860 |
Documents
| Newspaper | (Jackson) Mississippian, “The Last Revelation from Douglas,” April 3, 1860 | 04/03/1860 |