In 1928, as Herbert Hoover campaigned for the presidency, the country was largely prosperous. But a depression was slowly spreading through the agricultural sector. European agriculture had recovered from the ravages of World War I, cutting demand for American exports. And, as more and more land once devoted to fodder crops for horses and mules was turned over to producing food for humans, the food supply at home began to seriously outstrip demand.
I hadn’t thought of that before. Of course, the mechanisation of farms would reduce labour demand. But also the mechanisation of farms would “create land” as oil replaced oats.