Why does the US celebrate the holiday of thanks giving?

It is a way to be thankful that we are here at all, and to give thanks to the Lord for putting a roof over our head and putting food on our plate.

It started in the 1620's, when the pilgrims first came to Plymouth, they were having a terrible time, when the Indians began to help them, they did better, and they all lived in harmony. After a bountiful harvest, the Indians and the pilgrims came together and had a huge feast and thanked God that they were doing well and prospering.