Births on May 6

Roman Sanguszko, Polish general (d. 1881)

Prince Roman Adam Stanisław Sanguszko (1800–1881) was a Polish aristocrat, patriot, political and social activist.

14 May

Washington, D.C.
The process of the U.S. Government moving the United States capital city from Philadelphia to Washington, D.C. begins.
7 Jun

Saskatchewan River
David Thompson reaches the mouth of the Saskatchewan River in Manitoba.
14 Jun

Battle of Marengo
The French Army of First Consul Napoleon Bonaparte defeats the Austrians at the Battle of Marengo in Northern Italy and re-conquers Italy.
30 Aug

Slave rebellion
Gabriel Prosser postpones a planned slave rebellion in Richmond, Virginia, but is arrested before he can make it happen.
17 Nov

6th United States Congress
The United States Congress holds its first session in Washington, D.C.