Thanksgiving moved back to the fourth Thursday of November
In response to the widespread backlash to moving the date, President Roosevelt signed a resolution in 1941 designating the fourth Thursday in November as Thanksgiving.
According to the Congressional Research Service, by May of that year, Roosevelt had "concluded that the experiment of advancing the observance date had not worked."
"On December 26, 1941, President Roosevelt signed a joint resolution to settle the dispute and permanently established Thanksgiving Day as a federal holiday to be observed on the fourth Thursday in November," reported CRS.
"The intent of the joint resolution was to 'stabilize the date so that there [would] be no confusion at any time in the future.' President Roosevelt upon signing the resolution announced 'that the reasons for which the change was made do not justify a continued change in the date.'"