Fire up the tradition-making machine: It's time to update the Thanksgiving menu for future eaters.Image: Lore Sjöberg

This Thanksgiving, millions of Americans will sit down to a traditional meal in celebration of all that the New World has given us.

In memory of our ancestors — or the ancestors of the people who bought our ancestors, or the ancestors of the people who decided our ancestors didn’t really deserve land if they weren’t going to properly exploit it, or the ancestors of the people who resented our ancestors for coming over here and taking all the jobs they didn’t want — we’ll sit down...