On April 11, 1865, President Abraham Lincoln spoke to a crowd outside the White House, saying, “We meet this evening, not in sorrow, but in gladness of heart.” (It was Lincoln’s last public address.)

In 1921, Iowa became the first state to impose a cigarette tax, at 2 cents a package.

In 1945, during World War II, American soldiers liberated the Nazi concentration camp Buchenwald in Germany.

In 1966, Frank Sinatra recorded the song “Strangers in the Night” for his label, Reprise Records.

In 1968, President Lyndon B. Johnson signed into law the Civil Rights Act of 1968, which included the Fair Housing Act, a week after the assassination of Martin Luther King Jr.

In 1970, Apollo 13, with astronauts James A. Lovell, Fred W. Haise and Jack Swigert, blasted off on its ill-fated mission to the moon.