Today is Tuesday, Dec. 20, the 355th day of 2016. There are 11 days left in the year. In 1803, the Louisiana Purchase was completed as ownership of the territory was formally transferred from France to the United States. In 1860, South Carolina became the first state to secede from the Union as all 169 delegates to a special convention in Charleston voted in favor of separation. In 1946, the Frank Capra film "It's A Wonderful Life," starring James Stewart and Donna Reed, had a preview showing for charity at New York's Globe Theatre, a day before its official world premiere. In 1963, the Berlin Wall was opened for the first time to West Berliners, who were allowed one-day visits to relatives in the Eastern sector. In 1976, Richard J. Daley, the mayor of Chicago since 1955, died in office at age 74. In 1987, more than 4,300 people were killed when the Dona Paz, a Philippine passenger ship, collided with the tanker Vector off Mindoro island.