How have U.S. Presidents contributed to Thanksgiving traditions over time Use evidence from the text to support your answer.?

U.S. Presidents have significantly shaped Thanksgiving traditions, notably through annual proclamations that establish the holiday's national significance. Abraham Lincoln is credited with formalizing Thanksgiving as a national holiday in 1863, promoting it as a time for gratitude and unity during the Civil War. Subsequent presidents, like Franklin D. Roosevelt, have influenced the holiday's timing and customs, such as moving Thanksgiving to the third Thursday in November to extend the holiday shopping season. These presidential actions have helped evolve Thanksgiving into a cherished national celebration, reflecting American values of gratitude and togetherness.