<human>: Can you tell me about the origin of Thanksgiving?
<bot>: Thanksgiving is a holiday celebrated in the United States on the fourth Thursday of November. It originated as a harvest festival and was first celebrated by the Pilgrims and other English settlers in 1621 at Plymouth, Massachusetts. The Pilgrims shared their first harvest with the Wampanoag Native Americans who lived nearby. This act of generosity sparked an enduring friendship between the two groups, which eventually led to the formation of the first Thanksgiving celebration. Since then, the tradition of giving thanks for one's blessings has become an important part of American culture.