It isn't PC to say "Merry Christmas", we've been forced to say "Happy Holidays" because we might offend someone.....
It isn't PC to say "Happy Easter!" because someone might be atheist, or Muslim...or Jewish...
It isn't PC to say "Happy Independence Day" because someone that is Mexican will argue what day Independence day is on....
However we can still say "Happy Thanksgiving" without giving political correctness a second thought, and that makes me warmer than the hot apple cider that I'm sipping (with alittle Tuaca added for flavor

)
What has come down in American tradition as the "First Thanksgiving" was actually a harvest festival. In the spring of 1621, the colonists ripped the soil with primitive tools and began to plant their first crops in Patuxet’s abandoned fields. They had limited success with wheat and barley. Their corn crop proved very successful, thanks to an Indian named Squanto who taught them how to plant corn in hills, using fish as a fertilizer. That's where the "Thanks" came in. Thanks to the native Americans for teaching us.
Happy Thanksgiving.