ABSTRACT
In the article "Chairman Mao's Theory of the Differentiation of the Three Worlds Is a Major Contribution to Marxism-Leninism" by the Editorial Department of Jen-min jih-pao, it was pointed out that one task facing the Second World countries today, especially the developed countries in Europe, is defense of their national independence. This is entirely correct and fully conforms with the Marxist-Leninist principle of revolutionary tactics. In 1914, when First World War broke out, Lenin, basing himself on the Marxist axiom that war is the continuation of politics, comprehensively analyzed the cause of the war, showed with penetrating insight the rapacious and reactionary nature of this imperialist war and called on the proletariat of the countries concerned to oppose it resolutely. The scientific analyses by Lenin defended and developed the Marxist principle of tactics, illustrated the proletariat's attitude and tactics in regard to war in the era of imperialism.
