This is Melanie Kirkpatrick giving a presentation at the 2017 Lincoln Forum based on her book about Thanksgiving. She goes into Abraham Lincoln’s and Jefferson Davis’ thanksgiving proclamations.
The video’s description reads, “Author Melanie Kirkpatrick talked about the history of Thanksgiving in America, including President Lincoln’s proclamation in 1863 during the Civil War making it a national holiday. She also reflected on the life of Sarah Josepha Hale, a magazine editor known as the “Godmother of Thanksgiving,” who lobbied President Lincoln to create the holiday. This event was part of the annual Lincoln Forum symposium in Gettysburg, Pennsylvania.”