A couple of years ago, I tackled the main Thanksgiving myth (see #69) about the first Thanksgiving and also the one about popcorn and Pilgrims (see #70). This year I’ll send you to another site where Eric Thompson of Texas has tackled several Thanksgiving myths. I learned something from his site–I hadn’t known of a First Thanksgiving claim of 1541 from Texas. Really, many states point to an early feast and prayer event and claim it was the earliest Thanksgiving, but the truth is, our holiday began when Lincoln made it a holiday during the Civil War.
http://www.officespaceforrent.org/blog/6-myths-about-thanksgiving-revealed/
History Myths Debunked 
Your link goes to a 404 — NOT FOUND.
Thanks for letting me know. I checked that before I posted and it was live. Now . . . something’s off. I’ll fix it as best I can.
I found this very informative site from the Texas State Historical Association: http://texasalmanac.com/topics/history/timeline/first-thanksgiving
It has the two Texas thanksgivings, but also information about other early thanksgivings and a detailed rundown of the national Thanksgiving.
Thanks for the link. I like that they call it the Thanksgiving sweepstakes–funny!