1775 – Second Continental Congress in Philadelphia names George Washington Supreme Commander.
1837 – Panic of 1837: New York City banks fail, and unemployment reaches record levels.
1883 – First appendectomy performed in North America by Abraham Groves in Canada.
1908 – 1st Mother’s Day observed (Philadelphia)
1917 – Atlantic ships get destroyer escorts to stop German attacks.
1924 – J. Edgar Hoover appointed head of FBI.
1941 – 66th Preakness: Eddie Arcaro wins aboard Whirlaway, 2nd leg of successful Triple Crown.
1946 – Red Sox win 15th straight beat Yanks 5-4, DiMaggio hits Grand Slam.
1960 – John F. Kennedy wins primary in West Virginia.
1966 – 25 degrees (F) lowest temperature ever recorded in Cleveland in May.
1967 – Hank Aaron only inside the park HR (vs Jim Bunning)
1968 – Vietnam peace talks began in Paris between US and North Vietnam.
1971 – US special delivery rates go from 45 cents to 60 cents.
1983 – TV sitcom “Lavern & Shirley” last airs on ABC-TV.
1993 – Bill Walton is inducted the Naismith Memorial Basketball Hall of Fame.
1996 – Excel Communications, Inc. becomes the youngest company to ever join the New York Stock Exchange (NYSE), trading under the symbol (ECI)
2005 – A hand grenade thrown by Vladimir Arutyunian lands about 65 feet from U.S. President George W. Bush while giving a speech to a crowd in Tbilisi, Georgia, it malfunctions and does not detonate.
2015 – PGA Player Championship, TPC at Sawgrass: Rickie Fowler wins beating Kevin Kisner and Sergio Garcia by 1 stroke in a playoff.
2017 – Apple becomes the first company to be worth more than $800 billion.
2019 – Taxi service Uber becomes a public company opening on the New York Stock Exchange.
2019 – US begins raising tariffs on $250 billion of Chinese imports to 25% after trade talks fail.