An American pioneer wagon train known as the Donner Party became trapped by an exceptionally early, massive blizzard in the Sierra Nevada mountains of California. Stranded near Truckee Lake without food or adequate shelter, the emigrants endured months of sub-zero temperatures, frostbite, and progressive starvation. In a desperate bid for help, a small group known as 'The Forlorn Hope' set out on snowshoes, walking for 33 days through deep drifts; many died, and survivors resorted to cannibalism to keep moving. Of the original 87 members of the party, only 45 survived the winter, providing a harrowing look at the extreme psychological and physical limits of human survival during the westward expansion.

The sensationalized and horrifying accounts of the Donner Party's endurance and descent into cannibalism profoundly shocked the American public, deeply complicating the romanticized literary myth of Manifest Destiny. The tragedy inspired a vast subgenre of dark American frontier literature and psychological poetry that explored the breakdown of human civilization when confronted with absolute isolation and the primal will to survive at any cost.