After witnessing several children die from contaminated milk on a transatlantic voyage, American inventor Gail Borden developed and patented a process for evaporating water from milk using a vacuum pan, then sweetening and canning the resulting reduction. This breakthrough created a completely shelf-stable, bacteria-free dairy product that could be safely shipped to dense, unhygienic industrial cities where fresh milk was frequently adulterated with chalk or swill water. The product achieved massive commercial success when it was adopted as a standard field ration for Union troops during the American Civil War.

Borden's industrial transformation of a pure, traditional pastoral symbol (milk) into a sweetened, canned factory commodity captured the profound anxieties of the mid-nineteenth-century agrarian mind. Walt Whitman and subsequent realist poets noted this shift, using the imagery of canned goods and processed foods to reflect on the rising mechanical abstraction of daily life and the steady decline of direct human connection to the land.