On this date:

In 1496, Christopher Columbus concluded his second visit to the Western Hemisphere as he left Hispaniola for Spain.

In 1848, the U.S. Senate ratified the Treaty of Guadalupe Hidalgo, which ended the Mexican-American War.

In 1864, President Abraham Lincoln assigned Ulysses S. Grant, who had just received his commission as lieutenant-general, to the command of the Armies of the United States.

In 1876, Alexander Graham Bell’s assistant, Thomas Watson, heard Bell say over his experimental telephone: “Mr. Watson — come here — I want to see you” from the next room of Bell’s Boston laboratory.

In 1906, about 1,100 miners in northern France were killed by a coal-dust explosion.

In 1913, former slave, abolitionist and Underground Railroad “conductor” Harriet Tubman died in Auburn, New York; she was in her 90s.

In 1933, a magnitude 6.4 earthquake centered off Long Beach, California, resulted in 120 deaths.

In 1969, James Earl Ray pleaded guilty in Memphis, Tennessee (on his 41st birthday) to assassinating civil rights leader Martin Luther King Jr. (Ray later repudiated that plea, maintaining his innocence until his death.)

In 1980, “Scarsdale Diet” author Dr. Herman Tarnower was shot to death at his home in Purchase, New York. (Tarnower’s former lover, Jean Harris, was convicted of his murder; she served nearly 12 years in prison before being released in January 1993.)

In 1988, prior to the 50th anniversary of the Anschluss, Austrian President Kurt Waldheim apologized on his country’s behalf for atrocities committed by Austrian Nazis.

In 2000, Pope John Paul II approved sainthood for Katharine Drexel, a Philadelphia socialite who had taken a vow of poverty and devoted her fortune to helping poor blacks and American Indians. (Drexel, who died in 1955, was canonized in October 2000.)