
On Thursday, September 24, 1789, the first House of Representatives voted to recommend the First Amendment of the newly drafted Constitution to the states for ratification. The next day, Congressman Elias Boudinot from New Jersey proposed that the House and Senate jointly request of President Washington to proclaim a day of thanksgiving. As President, on October 3, 1789, George Washington issued a proclamation that created the first Thanksgiving Day designated by the national government. His proclaimation read as follows:
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 favor, 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 thanksgiving and prayer to be observed by acknowledging with grateful hearts the many 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 26th 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, for the signal and manifold mercies, and the favorable interpositions of his providence, which we experienced in the course and conclusion of the late war, for the great degree of tranquility, union, and plenty, which we have since enjoyed, for the peaceable and rational manner, in which we have been enabled to establish constitutions of government for our safety and happiness, and particularly the national One now lately instituted, for the civil and religious liberty with which we are blessed; and the means we have of acquiring and diffusing useful knowledge; and in general for all the great and various favors which he hath been pleased to confer upon us.
And also that we may then unite in most humbly offering our prayers and supplications to the great Lord and Ruler of Nations and beseech him to pardon our national and other transgressions, to enable us all, whether in public or private stations, to perform our several and relative duties properly and punctually, to render our national government a blessing to all the people, by constantly being a Government of wise, just, and constitutional laws, discreetly and faithfully executed and obeyed, to protect and guide all Sovereigns and Nations (especially such as have shown kindness unto us) and to bless them with good government, peace, and concord. To promote the knowledge and practice of true religion and virtue, and the encrease of science among them and Us, and generally to grant unto all Mankind such a degree of temporal prosperity as he alone knows to be best.
Given under my hand at the City of New York the third day of October in the year of our Lord 1789.
Washington again proclaimed a Thanksgiving in 1795 and President John Adams declared Thanksgivings in 1798 and 1799. James Madison renewed the tradition in 1814, in response to resolutions of Congress, at the close of the War of 1812. Madison also declared the holiday in 1815.
In the middle of the Civil War, President Abraham Lincoln proclaimed a national Thanksgiving Day, to be celebrated on the final Thursday in November 1863. Since 1863, Thanksgiving has been observed annually in the United States.
Lincoln's successors as president followed his example of annually declaring the final Thursday in November to be Thanksgiving. But in 1939, President Franklin D. Roosevelt broke with this tradition. November had five Thursdays that year and Roosevelt declared the fourth Thursday as Thanksgiving. With the country still in the midst of The Great Depression, Roosevelt thought an earlier Thanksgiving would give merchants a longer period to sell goods before Christmas. Increasing profits and spending during this period, Roosevelt hoped, would help bring the country out of the Depression. Republicans decried the change, calling it an affront to the memory of Lincoln. People began referring to November 30 as the "Republican Thanksgiving" and November 23 as the "Democratic Thanksgiving" or "Franksgiving".

Since 1947, the National Turkey Federation has presented the President of the United States with one live turkey and two dressed turkeys, in a ceremony known as the National Thanksgiving Turkey Presentation. John F. Kennedy was the first president reported to spare the turkey given to him and Ronald Reagan was the first to grant the turkey a presidential pardon, which he jokingly presented to his 1987 turkey. (The turkey was spared and sent to a petting zoo). George H. W. Bush made the turkey pardon a permanent annual tradition upon assuming the presidency in 1989, a tradition that has been carried on by every president each year since.