The United States, which by that time had become the world’s largest and most advanced economy, wouldn’t reach its apogee until 1915 when over 26 million horses lived and worked alongside humans. Within just a few decades, however, they would disappear from the world of work, substituted in a range of tasks by machines which were more reliable, didn’t get sick and, most importantly, led to far greater productivity. Paradoxical as it might seem, we employed animals like never before at the very moment they were becoming obsolete.