Thanksgiving Day originated from a harvest feast celebrated by the Pilgrims in Plymouth colony in 1621. The Pilgrims held the feast to give thanks for their first successful harvest in the New World after a difficult first winter where many had died. Over the years, the tradition of Americans gathering with family and friends over a feast on the last Thursday of November to give thanks became an important national holiday. Today on Thanksgiving, Americans come together to enjoy traditional foods like turkey, stuffing, mashed potatoes, cranberry sauce and pumpkin pie.