On October 20, 1923, at Belmont Park in New York, Kentucky Derby champion Zev toed the starting line alongside Epsom Derby winner Papyrus, the top colt from England, to compete for a $100,000 purse. Years of Progressive reform efforts had nearly eliminated horse racing in the United States only a decade earlier. But for weeks leading up to the match race that would be officially dubbed the "International," unprecedented levels of newspaper coverage...