Thanksgiving is celebrated in Canada and the United States to commemorate the harvest season, blessings received, and time spent with family and friends. It traces its origins to a 1621 feast shared between Pilgrims and Native Americans after the Pilgrims' first successful harvest in Plymouth. Modern Thanksgiving traditions include sharing a meal of turkey, potatoes, vegetables and pie, watching American football games, and kicking off the holiday shopping season with Black Friday sales.