Will Hill:
Daas Torah would disagree. R’ Moshe says:
On the issue of joining with those who think that Thanksgiving is like a holiday to eat a meal: since it is clear that according to their religious law books this day is not mentioned as a religious holiday and that one is not obligated in a meal [according to Gentile religious law] and since this is a day of remembrance to citizens of this country, when they came to reside here either now or earlier, halacha sees no prohibition in celebrating with a meal or with the eating of turkey. One sees similar to this in Kiddushin 66 that Yanai the king made a party after the conquest of kochlet in the desert and they ate vegetables as a remembrance.
As someone who calls for adherence to Daas Torah regardless of whether it makes sense to you, I suggest you retract or modify that statement.