The modern Thanksgiving holiday tradition is commonly, but not universally, traced to a sparsely documented 1621 celebration at Plymouth in present-day Massachusetts. The 1621 Plymouth feast and thanksgiving was prompted by a good harvest. Pilgrims and Puritans who began emigrating from England in the 1620s and 1630s carried the tradition of Days of Fasting and Days of Thanksgiving with them to New England. Several days of Thanksgiving were held in early New England history that have been identified as the “First Thanksgiving”, including Pilgrim holidays in Plymouth in 1621 and 1623, and a Puritan holiday in Boston in 1631.
As President of the United States, George Washington proclaimed the first nationwide thanksgiving celebration in America marking November 26, 1789, “as a day of public thanksgiving and prayer to be observed by acknowledging with grateful hearts the many and signal favours of Almighty God”.
Thanksgiving, currently celebrated on the fourth Thursday in November by federal legislation in 1941, has been an annual tradition in the United States by presidential proclamation since 1863 and by state legislation since the Founding Fathers of the United States. Historically, Thanksgiving has traditionally been a celebration of the blessings of the year, including the harvest. What Americans call the “Holiday Season” generally begins with Thanksgiving.
In modern times the President of the United States, in addition to issuing a proclamation, will “pardon” a turkey, which spares the bird’s life and ensures that it will spend the duration of its life roaming freely on farmland.