On May 19, 1943,

in his second wartime address to the U.S. Congress, British Prime Minister Winston Churchill pledged his country's full support in the fight against Japan. That same day, top U.S. and British officials meeting in Washington reached agreement on May 1, 1944 as the date for the D-Day invasion of France (the operation ended up being launched more than a month later).

In 1536,

Anne Boleyn, the second wife of England's King Henry VIII, was beheaded after being convicted of adultery.

In 1780,

a mysterious darkness enveloped much of New England and part of Canada in the early afternoon.