Until 1939, Thanksgiving was held in early December. But merchants wanted more time to peddle their Christmas wares so they lobbied President Franklin D. Roosevelt to move Turkey Day back a week. The change naturally angered much of the public and some refused to honor what they called "Franksgiving." As a result, for a very short time, America celebrated two Thanksgiving Days and two Black Fridays.
To learn more about the surprisingly interesting history of Black Friday, check out Coupon Sherpa's post "Once Upon a Time There Were Two Black Fridays?"