December 20th:
According to Wikipedia and other sources, on December 20th:
1606 – The Virginia Company loads three ships with settlers and sets sail to establish Jamestown, Virginia, the first permanent English settlement in the Americas.
1803 – The Louisiana Purchase is completed at a ceremony in New Orleans, Louisiana.
1860 – South Carolina becomes the first state to attempt to secede from the United States.
1946 – The popular Christmas film It's a Wonderful Life is first released in New York, New York.
1967 – A Pennsylvania Railroad Metroliner reaches over the limit of 155 mph on their New York Division, also present day Amtrak's Northeast Corridor.