The author makes the curious assertion that returning vets from WWI caused such a glut in the labor market that it contributed to the Great Depression.
For one thing, the timing is all wrong: 1918 to 1929 is eleven years. Second, the 1918 flu epidemic reduced surplus workers considerably. Third, wasn't the Depression caused by drought and over-fertilization leading to massive crop failures, compounded by wild reckless speculation in the Stock Market?
This author has not only gone off the rails, he's spilling toxic chemicals.