This story appears in the February 2019 issue of National Geographic magazine. Ketchup—that cheerful red sauce sold in handy glass bottles—first came on the American market in the 19th century.

Following is a transcript of the video. Narrator: Ketchup, it's everywhere in the US. 97% of Americans have a bottle in their fridge. It's the sauce we put on our hamburgers, our hot dogs, and our ...

Ketchup has always been a part of my life. It's a staple in my refrigerator and can be found on the table at nearly every restaurant I visit, always next to the napkins. The comforting red sauce ...