US slave revolt leader Nat Turner was arrested in Virginia on October 30, 1831. Turner, inspired by a religious vision, led a rebellion in August of that year which resulted in the deaths of 55 white people, including the family who enslaved Turner. White mobs later killed between 36 and 102 Black people in retaliation for the attacks. After his October capture, Turner became one of 55 people to be executed by Virginia in connection with the rebellion. Learn more about Nat Turner and Turner's Rebellion.

On October 30, 1905 [October 17 in the Julian Calendar], Tsar Nicholas II granted Russians basic civil liberties in the October Manifesto.

On October 30, 1941, President Franklin Roosevelt approved $1 billion in wartime aid to the Allies under the Lend-Lease Act. America did not formally enter World War II until December of 1941, but the US Government nonetheless provided crucial aid to the Allied Powers from the passage of the Lend-Lease Act in March of 1941 through the end of the war. The Lend-Lease Agreement between the US and the UK was formalized the following year.