October 16, 1916: George F. Johnson announces the policy of a 40-hour workweek in his factories.
August 18, 1920: Tennessee narrowly ratifies the Nineteenth Amendment, granting women the vote.
July 21, 1925: John T. Scopes found guilty of unlawfully teaching evolution in the so-called Scopes Monkey Trial, though the verdict would be overturned on a technicality.
July 5, 1935: The NLRB is established.
July 16, 1945: The first test detonation of a nuclear bomb, called "the Gadget."
August 6, 1945: Birth of MLB pitcher John Alexander "Andy" Messersmith.
1952: The year the Hershey-Chase experiments were conducted, demonstrating DNA was the genetic material.
May 17, 1954: The Warren Court finds segregated public schools unconstitutional.
February 19, 1963: Publication of Betty Friedan's The Feminine Mystique.
July 2, 1964: The Civil Rights Act of 1964 is signed into law by President Johnson.
1969: Alfred Hershey and Martha Chase win the Nobel for their findings re: DNA.
1970: California Gov. Ronald Reagan signs the first law legalizing no-fault divorce in a US state.
1973: Publication of Kurt Vonnegut Jr.'s Breakfast of Champions.
September, 1983: Atari buries thousands of game cartridges in a New Mexico landfill, especially E.T. the Extraterrestrial.
May 22, 1985: Release of Rambo: First Blood Part II.
September 11, 2001: Release of Mariah Carey's Glitter.
October 15, 2010: No-fault divorce becomes legal in all 50 states and the District of Columbia.