George, here is a simple answer.
We Americans, and Canadians too!, often call Thanksgiving Day, Turkey Day.
The simple reason is because we traditionally eat Turkey on Thanksgiving. Thanksgiving dates back to the times when the United States AND Canada were British colonies.
Those Brits were not to great at farming or domestic hunting so our original peoples helped them get through the hard times by teaching them about crops which could grow here and the best manner to hunt North American animals. Those Brits were great at shutting up and learning fast. We now celebrate those traits of the original British settlers of our Countries (USA and Canada).
So George, go eat some bird and think of most of this community being thankful to the Brits.