Thanksgiving has nothing to do with your mythical pictures or tales about Pilgrims clasping their hands in "thanks."
It is about George Washington requiring a holiday of feast about the end of Revolution.
There is some background to this.
In that era, harvest/end-of-year festivals were pretty universal across Europe.
And they were mandatory.
Businesses were required to close, whether the owner or any of the employees wanted to or not. Protestants were forced to celebrate feast days, against their religious belief. And Protestant business owners were forced to pay extra taxes for these holidays, meaning they missed work and they had to pay for religious celebrations they didn't believe in.
America had the first secular non-compulsive Thanksgiving celebrations. You didn't have to celebrate it at all if you didn't want to. And many did not, choosing to work and do business instead.
Strangely enough, everyone has forgotten this now. There is public pressure to close every business and shut down the federal/state governments and commerce for 4-5 days. The feds now want a five-day weekend with a paid day off after Thanksgiving (because they are not already overpaid quite enough compared to the private sector).
America has forgotten the value of our heritage; to guard and defend our nation. With our lost heritage, we are doomed to fight enemies in foreign nations while importing them onto our land as invited guests so we fight among ourselves choosing whom is an enemy.
The US Government has caused the grief of and about our nation. It is not happenstance, either.