"...WHEREAS 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 favour; and Whereas both Houses of Congress have, by their joint committee, requested me "to recommend to the people of the United States a DAY OF PUBLIC THANSGIVING and PRAYER, to be observed by acknowledging with grateful hearts the many and signal favors of Almighty God, especially by affording them an opportunity peaceably to establish a form of government for their safety and happiness:" NOW THEREFORE, I do recommend and assign THURSDAY, the TWENTY-SIXTH DAY of NOVEMBER next, to be devoted by the people of these States to the service of that great and glorious Being who is the beneficent author of all the good that was, that is, or that will be; that we may then all unite in rendering unto Him our sincere and humble thanks for His kind care and protection of the people of this country previous to their becoming a nation..."
From the Thanksgiving Proclamation of George Washington, President of the United States. October 3, 1789. Source: The Massachusetts Centinel, Wednesday, October 14, 1789.
[Thanks to Padre of the "Not So Quiet" Catholic Corner].