After gold was found in California in 1848, the fastest route across America ran through Panama's jungle. The Panama Railroad, finished in 1855, linked the oceans at a high and poorly counted human cost. The episode also covers the Chinese laborers at Matachín, a racial pay hierarchy that foreshadowed the Canal Zone, and the 1856 Watermelon Riot.
The railroad's death toll is uncertain; the 'dead man for every tie' story is a myth, and estimates reach up to about 12,000, with non-white deaths poorly recorded. The count of Chinese laborers and suicides varies by source, and the corpse trade is documented but not precisely quantified.