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I don't have sufficient context to write an accurate overview of "1621." While 1621 is historically significant as the year of the first Thanksgiving harvest celebration in Plymouth Colony, I cannot confirm this is what you're referring to without more information about what specific topic, event, person, or work called "1621" you want me to explain. Could you provide additional context about what "1621" refers to?

AI-generated from the Wikipedia summary — may contain errors.