Why do we eat turkey on Thanksgiving? The history of the holiday's traditional foods

Certain holidays are associated with different foods, and for Thanksgiving, that's turkey — but why is that what we eat? We asked a history expert to learn more. 

Turkey's spot on the holiday table can be traced back to a famous American author Sarah Josepha Hale, and her popular book, in which she described a traditional Thanksgiving meal that included a roast turkey.