Constantine became Roman Emperor in 306 AD and ruled for 31 years. But also Constantine had a problem. What was he to do with the followers of Yeshua (Jesus) who were spreading rapidly ?? They did keep their strong faith even if they were tortured and killed. So far all Roman Emperors had persecuted the early followers of Yeshua (Jesus)- but were not capable of stopping them. Constantine realized that he cannot stop them either. He did not join them but he made a new religion around another and different Greco- Roman Jesus beside them. With another spirit and another gospel.
Even today people are still celebrating this pagan holiday and taking great pleasure in doing so. Every year, millions of families look forward to non- biblical Thanksgiving so they can get together with family and give thanks to God for all their blessings. Regretfully just like the pagans of Ancient Rome. Thanksgiving is a very very good example of religious manmade traditions with no even shaky connection(s) to the Bible. The true story doesn't have quite the same fuzzy feelings associated with it as the one where the Indians and Pilgrims are all sitting down together at the big feast... Thanksgiving had brutal and bloody beginning !!