TODAY IN HISTORY

On Dec. 6, 1917, some 2,000 people were killed when an explosives-laden French cargo ship, the Mont Blanc, collided with the Norwegian vessel Imo at the harbor in Halifax, Nova Scotia, setting off a blast that devastated the Canadian city. Finland declared its independence from Russia.

On this date:

In 1790, Congress moved to Philadelphia from New York.

In 1865, the 13th Amendment to the U.S. Constitution, abolishing slavery, was ratified as Georgia became the 27th state to endorse it.

In 1889, Jefferson Davis, the first and only president of the Confederate States of America, died in New Orleans.

In 1907, the worst mining disaster in U.S. history occurred as 362 men and boys died in a coal mine explosion in Monongah, West Virginia.

In 1922, the Anglo-Irish Treaty, which established the Irish Free State, came into force one year to the day after it was signed in London.

In 1942, comedian Fred Allen premiered "Allen's Alley," a recurring sketch on his CBS radio show spoofing small-town America.

In 1947, Everglades National Park in Florida was dedicated by President Harry S. Truman.

In 1957, America's first attempt at putting a satellite into orbit failed as Vanguard TV3 rose about four feet off a Cape Canaveral launch pad before crashing down and exploding.

In 1967, three days after the first human heart transplant took place in South Africa, a surgical team at Maimonides Medical Center in Brooklyn, New York, led by Dr. Adrian Kantrowitz transplanted the heart of a brain-dead two-dayold baby boy into an 19-day-old infant who died six hours later.

In 1973, House minority leader Gerald R. Ford was sworn in as vice president, succeeding Spiro T. Agnew.

In 1982, 11 soldiers and six civilians were killed when an Irish National Liberation Army bomb exploded at a pub in Ballykelly, Northern Ireland.

In 1989, 14 women were shot to death at the University of Montreal's school of engineering by a man who then took his own life.

Ten years ago: CIA Director Michael Hayden revealed the agency had videotaped its interrogations of two terror suspects in 2002 and destroyed the tapes three years later out of fear they would leak to the public and compromise the identities of U.S. questioners; the disclosure brought immediate condemnation from Capitol Hill.