Step 1 : Introduction to the question "Who encouraged Abraham Lincoln to make Thanksgiving a national holiday?"
...Much of the credit for President Abraham Lincoln's Thanksgiving Proclamation should probably go to a woman named Sarah Josepha Hale. As a highly influential magazine editor, Sarah Hale led a 36-year campaign advocating for a national day of gratitude, through an extensive collection of articles and letters. Her September 28, 1963 letter to Lincoln is often cited as the main factor for Lincoln's Proclamation. Adding a fascinating layer to this historical narrative, Hale was also the author of the beloved nursery rhyme "Mary Had a Little Lamb."