It happened on… September 17

Swedish climate activist Greta Thunberg addresses the U.S. Congress: “I know you're trying, but it's just not enough—sorry.”

The 24th Olympic Games open in Seoul, South Korea.

Brian Mulroney becomes Canada's 18th prime minister. He succeeds John Turner.

Vanessa Williams (NY), age 20, is crowned the 56th Miss America 1984, the first African American to hold the title.

Fleetwood Mac's album “Rumors” reaches No. 1 in the U.S. and remains there for 19 consecutive weeks.

The TV series “MAS*H” premieres on CBS. The series will air until February 1983.

Forward Guy Lafleur plays his first game with the Montreal Canadiens.

The TV series “Mission: Impossible” premieres on CBS.

The TV series “Bewitched” premieres on ABC.

The first successful separation surgery for conjoined twins is performed on sisters Carolyn and Catherine Mouton.

The National Football League is founded in Canton, Ohio; 12 teams pay $100 (US) to join the American Professional Football Association, which will be renamed the NFL in 1922.

Phillip W. Pratt invents the first sprinkler system.

The first library in Montreal, the Municipal Library, opens. It contains 2,000 volumes.