帝国主義論
In particular, Lenin drew much from "Imperialism: A Study" to support and substantiate "Imperialism, the Highest Stage of Capitalism" (1916), which then was a contemporary, war-time analysis of the geopolitical crises of the imperial empires of Europe that culminated in the First World War (1914–18). Lenin said that Karl Kautsky had taken the idea of ultra-imperialism from the work of J.A. Hobson, and that: