In this date in history:
In 1787, Pennsylvania became the second state to ratify the U.S. Constitution.
In 1870, Joseph Hayne Rainey of South Carolina was sworn in as the first African-American to serve in the U.S. House of Representatives.
In 1901, Italian physicist and radio pioneer Guglielmo Marconi sent the first radio transmission across the Atlantic Ocean.
In 1913, two years after it was stolen from the Louvre Museum in Paris, Leonardo da Vinci's masterpiece The Mona Lisa was recovered in a Florence, Italy, hotel room.
In 1917, the Rev. Edward J. Flanagan, a 31-year-old Irish priest, opened the doors to Boys Town, a home for troubled and neglected children in Omaha. He lived by the adage, There is no such thing as a bad boy.
In 1937, Japanese planes bombed and sank the U.S. gunboat Panay in the Yangtze River north of Nanking, China. Japan later said it was a mistake.
In 1975, Sara Jane Moore said she willfully tried to kill U.S. President Gerald Ford. She was sentenced to life in prison but was released Dec. 31, 2007.
In 1981, martial law was imposed in Poland.
In 1985, the crash of an Arrow Air DC-8 military charter on takeoff from Gander, Newfoundland, killed all 256 aboard, including 248 U.S. soldiers.