Hello, MatBell! I'm not confident in authoritatively answering your question. With the years I have become a largely minimally-participating observer of the society around me. My impression is the importance of Thanksgiving varies from family to family.

When I was young, one almost never saw Christmas decorations before Thanksgiving. Now it is common to see Christmas decorations and commercial sales during much of November. I believe I saw the first Christmas decorations this year - in a store - sometime in October.