On this date in 1917, U.S. President Woodrow Wilson asked U.S. Congress to declare war against Germany.
On this date in 1945, American forces invaded Okinawa, Japan.
On this date in 1965, Soviet cosmonaut Aleksei Leonov made the first ‘spacewalk’ as he left a Voskhod 2 capsule and floated outside it for twenty minutes, secured by a tether.