May 1st: Diocletian retires as Roman emperor.
May 2nd: The U.S. stops minting the 20 cent coin.
May 3rd: Edmond Halley first observes “Bailey’s Beads” during a lunar eclipse.
May 4th: Rhode Island declares independence from Britain.
May 5th: The 5th Olympic Games are hosted in Sweden.
May 6th: The U.S. begins rationing sugar during WWII.
May 7th: The city of New Orleans is founded.
May 8th: The first and only U.S. death by hailstones.
May 9th: Mother’s day is founded.
May 10th: Christopher Columbus discovers the Cayman Islands.
May 11th: Constantinople becomes the capital of the Roman Empire.
May 12th: The first ice cream advertisement.
May 13th: First performance of Finland’s national anthem.
May 14th: Louis the XIV becomes the king of France at age 4.
May 15th: Cape Cod is discovered by Bartholomew Gosnold.
May 16th: Denmark abolishes slave trade.
May 17th: A fire destroys St. Louis, Missouri.
May 18th: Montreal, Canada is founded.
May 19th: Mary Queen of Scots is arrested.
May 20th: An earthquake hits Kamakura, Japan.
May 21st: St. Helena, an island off the coast of Africa, is discovered.
May 22nd: The 14th recorded passage of Halley’s comet in 760.
May 23rd: The Netherlands becomes independent from Spain.
May 24th: “Mary Had a Little Lamb” is first published.
May 25th: The production of the Model T officially ends.
May 26th: Lewis and Clark first find the Rocky Mountains.
May 27th: Birt Acres patents the film camera.
May 28th: The first indoor swimming pool opens.
May 29th: Rhode Island officially ratifies the U.S. constitution.
May 30th: Christopher Columbus makes his 3rd trip to America.
May 31st: The New Orleans mint closes.