In 1939, President Roosevelt changed the date of Thanksgiving from November 30 to November 23, supposedly to stimulate Christmas shopping by increasing the number of shopping days between Thanksgiving and Christmas. However, the president's action generated chaos as businesses, schools, etc. had already planned on Thanksgiving falling on the traditional date, and some states continued to observe it on the 30th.
The confusion resulted in singer Ginny Simms proclaiming 1939 to be the year of "one Orson Welles, two Thanksgivings and Three Little Fishies." The movie "Holiday Inn" (1942) also featured a scene showing a turkey who was confused about the date of Thanksgiving.
How funny. As much as some decry consumerism, etc. nowadays, it’s interesting to see how FDR wanted to lengthen the Christmas shopping season, and hopefully stimulate more sales.