Why have we all forgotten to say - thank you'?

Boil away all the romance of the Thanksgiving origin story and what you get is this: a band of religious separatists on the brink of starvation who celebrated their first successful harvest with a feast. A century and a half later, George Washington proclaimed a day of "public thanksgiving" to acknowledge the "Signal Favours of Almighty God," by which he meant not being annihilated by the British.

http://www.bostonglobe.com/magazine/2014/11/30/why-have-all-forgotten-say-thank-you/lm8SiwHcu1cX8T4uaKlflO/story.html