First live sporting event (boxing) is broadcasted on radio

Atomic submarine USS Thresher sinks in the Atlantic

NASA introduces the first astronauts

North Atlantic Treaty Organization (NATO) pact signed

The Pony Express Begins

Ponce de León claims Florida for Spain

The House of Representatives elects first Speaker

King George endorses New England Restraining Act

Appomattox, the final campaign in the Civil War, begins

Nuclear disaster at Three Mile Island

Japanese cherry trees planted along the Potomac

Successful Polio Vaccine is announced

Parliament passes the Quartering Act

The initials “O.K.” are first published in The Boston Morning Post. Meant as an abbreviation for “oll korrect,” a popular slang misspelling of “all correct” at the time

Stamp Act imposed on American colonies

Martin Luther King Jr. begins the march from Selma to Montgomery

Benjamin Franklin, Silas Deane and Arthur Lee present themselves to France’s King Louis XVI as official representatives of the United States.

First Academy Awards telecast on NBC

Wells and Fargo start shipping and banking company

William Hershel discovers the planet Uranus