[Firestormalpha]

You could check here. I don't know the accuracy of it's facts, though. I haven't exactly read through the site and I never paid too much attention in history.

I know thanksgiving was the first harvest feast started by the pilgrims. They brought the Native Americans over to celebrate a plentiful harvest and give thanks for the harvest. The Natives got invited more or less in thanks for their assistance in teaching to new settlers how to grow crops effectively. That's what I remember.