When was Thanksgiving invented?

Thanksgiving as a holiday has roots in ancient harvest festivals and religious traditions, but the specific holiday celebrated in the United States traces back to the early 17th century. The first Thanksgiving in the United States is commonly associated with the Pilgrims in 1621, who held a feast to give thanks for their first successful harvest in the New World. However, Thanksgiving did not become an official national holiday until President Abraham Lincoln proclaimed it as such in 1863 during the Civil War.