Did You Know? Abraham Lincoln established Thanksgiving as a national holidayThe idea of creating a formal national Thanksgiving Day holiday originated with Illinois born President Abraham Lincoln?
In an 1863 proclamation – amid the still-raging Civil War – Lincoln designated Thanksgiving to be celebrated on the fourth Thursday of November.
"He was always looking for ways to unify the nation in a terrible time of war," said Lincoln biographer Ronald C. White Jr.

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Official Thanksgiving Holiday - USA Today
Thanksgiving in the United States