Manufacturing, production and efficiency had increased through necessity during the Great War. America had emerged as a world industrial leader and the US economy was booming, profits were increasing which led to the period in American history called the Roaring Twenties with a massive rise in consumerism for the wealthy.
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Feudalism worked easy because it was a system that worked from top to bottom. At the top you had the King which provided money for the Nobility that provided troops and protection for the king. Then the Nobility would bestow the land to his knights that would give the land to the peasants and they owned the land and farmer on it. The knights would provide military service for food that they farmed.