Thanksgiving Day is celebrated on the last Thursday of November in the United States. Families come together for a big feast, eating traditional foods like turkey, stuffing, potatoes, and pumpkin pie. One tradition is for each person to go around saying what they are thankful for. The origins of Thanksgiving date back to 1621, when the Pilgrims celebrated a successful harvest with the Native Americans who had helped them survive their first year in America. This feast became an annual tradition and is now a national holiday celebrated in November.