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Proclamation: A National Thanksgiving
by George Washington

In this foundational American document, Washington emphasizes that "it is
the duty of all nations to acknowledge the providence of Almighty God, to
obey His will, to be grateful for His benefits, and humbly to implore His
protection and favor."

http://press-pubs.uchicago.edu/found

ers/documents/amendI_religions54.html