The Decline of the West (German: Der Untergang des Abendlandes), or more literally, The Downfall of the Occident, is a two-volume work by Oswald Spengler.
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The first volume, subtitled Form and Actuality, was published in the summer of 1918.[1] The second volume, subtitled Perspectives of World History, was published in 1922.[2] The definitive edition of both volumes was published in 1923.[3]