The First Thanksgiving by Jean Leon Gerome Ferris

Thanksgiving Day is a harvest festival celebrated primarily in the United States and Canada. Traditionally, it has been a time to give thanks for a bountiful harvest. While it may have been religious in origin, Thanksgiving is now primarily identified as a secular holiday. It is sometimes casually referred to as Turkey Day.

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In Canada, Thanksgiving Day is celebrated on the second Monday in October, which is Columbus Day in the United States. In the United States, it falls on the fourth Thursday of November.
source : wikipedia.org