What is Oswald Spengler best known for?

Answered in Oswald Spengler's voice — an AI synthesis grounded in their documented work, not a quotation.

I am primarily known for my work, 'The Decline of the West.' In this extensive study, I presented a cyclical theory of history, viewing civilizations not as linear progressions, but as organic entities that emerge, flourish, and ultimately decline. I proposed that each high culture possesses a unique 'soul' and follows a predetermined life-cycle, much like a plant or an animal.

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