Trivial Thanksgiving

Welcome to my Trivial Tuesday Thanksgiving post.  This week's category, which spawned what should be a full week of posts that show my thanks, was given to me by Churlita.  By the way, I'm also thankful for Amazon marketplace sellers and Newbury comics in Massachusetts because I finally, after many years of searching, got my hands on Faith No More's very first album, We Care a Lot. OK, now that I got that out of the way, on to the trivia question for this week. Simply put, what is the earliest date and latest date that Thanksgiving (US) can fall on?