On May 22, 1939, the foreign ministers of Germany and Italy, Joachim von Ribbentrop and Galeazzo Ciano, signed a pact committing their two countries to a military and political alliance.

In 1964, President Lyndon B. Johnson, at the University of Michigan, outlined the goals of his “Great Society,” saying that it “rests on abundance and liberty for all” and “demands an end to poverty and racial injustice.”

In 1985, U.S. sailor Michael L. Walker was arrested aboard the aircraft carrier Nimitz, two days after his father, John A. Walker Jr., was apprehended by the FBI; both were later convicted of spying for the Soviet Union. (Michael Walker served 15 years in prison and was released in 2000; John Walker Jr. died in prison in 2014.)

In 1992, after a reign lasting nearly 30 years, Johnny Carson hosted his final episode of NBC’s “Tonight Show.” (Jay Leno took over as host three days later.)