What American holiday was campaigned for by author, Sarah Josepha Hale, whose work was published in an American periodical in the 19th Century?
Arthur's Magazine: Arthur's Magazine (1844–1846) was an American literary periodical published in Philadelphia in the 19th century. Sarah Josepha Hale:  Hale famously campaigned for the creation of the American holiday known as Thanksgiving, and for the completion of the Bunker Hill Monument.
Thanksgiving