Notably, while Heinz was selling both Catsup and ketchup in glass bottles,
the first to do so commercially was Jones Yerkes, who introduced the practice in 1837.
This claim is supported by the fact that Heinz sold two types of these condiments in the 1880s, a cheaper,
Duquesne Catsup, and a more expensive, Keystone Ketchup.
In either case, at least part of the reasoning behind using it as a weapon in the growing trade war seems to be that ketchup,
also spelled Catsup, is one of those products that sounds distinctly American,
poured generously on burgers and fries at baseball parks and Fourth of July barbecues across the US.