Today in history: March 31

On March 31, 1968, President Lyndon B. Johnson stunned the country by announcing during a televised address that he would not seek re-election.
On this date:
In 1889, French engineer Gustave Eiffel unfurled the French tricolor from atop the Eiffel Tower, officially marking its completion.
In 1923, the first U.S. dance marathon, held in New York City, ended with Alma Cummings, who had danced with six consecutive male partners, setting a world record of 27 hours on her feet.
In 1933, President Fra