History of Thanksgiving and how it's changed over the years Twin Falls/November 26th is Thanksgiving, one of the most popular holidays on the American calendar. Celebrated on the last Thursday of every November. Many Americans celebrate this holiday,even though many do not know the history of Thanksgiving. It all started In 1621, the Plymouth colonists and Wampanoag Indians shared an autumn harvest feast that is acknowledged today as one of the first Thanksgiving celebrations in the colonies. For more than two centuries, days of thanksgiving were celebrated by individual colonies and states, but since then many of the traditions have changed. Since there were plenty of wild turkeys in 1621, it makes sense to assume that the birds were featured