More FOX News drivel that blows up any criticism of the "USA is #1 and was granted by God to Americans" into a national crisis or threat against the country. They did the same thing last year or the year before with what Bill O'Liely called "War on Christmas." It's a way to get people to unify in a xenophobic manner because they think they (or their 'values') might be under attack. It also intends to discourage people who disagree with the majority to be silent, lest they be castigated as treasonous.
Did anyone say that Thanksgiving should be ended? NO. From what this says, someone sent an e-mail to other staff members (NOT to students) that gives factual information and also asks people to remember the native peoples who participated in Thanksgiving whose populations have been decimated by the growth of the USA.
When you teach American as all happy, triumphant, and rejoicing instead of presenting different sides of the story, it's not history, it's propaganda. FOX News knows all about this.