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Plimouth Plantation: Thanksgiving Interactive: You Are the Historian
This site, developed by Plimoth Plantation, offers visitors the chance to use the skills of historians to peel away the layers of myth and misconception surrounding "The First Thanksgiving" and discover what might really have happened...
US National Archives
Nara: Congress Establishes Thanksgiving
From the National Archives, an essay on the establishment of the American holiday of Thanksgiving as a legal holiday starting with the original proclamation in 1789 celebrating it on different days or months up to the 1941 resolution...