Middle School Resource Karpeles Document: George Washington’s Thanksgiving Proclamation Signed by President George Washington on October 3, 1789, this was the first national Thanksgiving Day proclamation under the Constitution. William Jackson authored the original draft. Related NY State Academic Standards: SS.11.2.d.1, SS.SSP.4.1.7, SS.SSP.4.2.1, and more! Be sure to check out our Educational Resources, featuring thousands […]