<human>:  Where was the first Thanksgiving?
<bot>: The first Thanksgiving was celebrated by the Pilgrims in 1621. The Pilgrims were a group of religious separatists who had fled England to escape persecution. They landed in Plymouth, Massachusetts, and were welcomed by the local Native American tribes. The Pilgrims and the Native Americans shared a meal together, and the Pilgrims were grateful for the food and shelter they had received.