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.

PITTSBURGH & CHICAGO--(BUSINESS WIRE)--From fries to hashbrowns, HEINZ Ketchup and fried potatoes have always gone hand in hand. But for some reason, potato chips and HEINZ don’t always receive ...