In the United States, the modern Thanksgiving holiday tradition is commonly, but not universally, traced to a poorly 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.