December 11 is the 345th day of the year (346th in leap years) in the Gregorian calendar.
1816 – Indiana becomes the 19th U.S. state.
1934 – Bill Wilson, co-founder of Alcoholics Anonymous, takes his last drink and enters treatment for the last time.
1946 – The United Nations International Children's Emergency Fund (UNICEF) is established.
1972 – Apollo 17 becomes the sixth and last Apollo mission to land on the moon.
2008 – Bernard Madoff is arrested and charged with securities fraud in a $50 billion Ponzi scheme.