In 1789, George Washington became the first of many US presidents to formally proclaim a day of "public thanksgiving and prayer." evgenyb - stock.adobe.com
The first Thanksgiving in the New World was celebrated in 1621, nearly a year after the Pilgrims landed at Plymouth in the Massachusetts Bay Colony.
In 1789, George Washington became the first of many US presidents to formally proclaim a day of “public thanksgiving and prayer”:
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 t

New York Post Opinion

The Virginian-Pilot
Riverbender.com
Deseret News
America News
Cover Media
Associated Press US and World News Video
AlterNet
KSNB Local4 Central Nebraska
Daily Voice