On this day: August 20

POSTED: 12:46 AM PDT Aug 19, 2012    UPDATED: 11:00 PM PDT Aug 19, 2012 

Charles Darwin publishes his theory of evolution, the NFL is founded, Lou Gehrig belts his 23rd career grand slam and NASA heads for Mars, all on this day.

OTD August 20 - Civil War
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Library of Congress

1866: President Andrew Johnson formally declares the American Civil War over. The fighting had stopped months earlier.

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