The Thanksgiving proclamations are the declarations made by the various authorities in regard of the Thanksgiving Day celebrations. It is believed that first Thanksgiving Day celebrations were held in 1621. But later it seemed to be a difficult task for the authorities to decide a perfect day for the Thanksgiving Day celebrations. So in different years the presidents of the United States issued Thanksgiving proclamations and came up with new dates for the Thanksgiving Day.
1. The First Thanksgiving Proclamation (1676)