World revolution is the Marxist concept of overthrowing capitalism in all countries through the conscious revolutionary action of the organized working class. For theorists, these revolutions will not necessarily occur simultaneously, but where and when local conditions allow a revolutionary party to successfully replace bourgeois ownership and rule, and install a workers' state based on social ownership of the means of production. In most Marxist schools, such as Trotskyism and Communist Left, the essentially international character of the class struggle and the necessity of global scope are critical elements and a chief explanation of the failure of socialism in one country.
The end goal of such internationally oriented revolutionary socialism is to achieve world socialism, and later, a communist society.
The October Revolution of 1917 in Russia sparked a revolutionary wave of socialist and communist uprisings across Europe, most notably the German Revolution, the Hungarian Revolution, Biennio Rosso and the revolutionary war in Finland with the short lived Finnish Socialist Workers' Republic, which made large gains and met with considerable success in the early stages; .
Particularly between 1918 and 1919, it seemed plausible that capitalism would soon be swept from the European continent forever. Given the fact that European powers controlled the majority of Earth's land surface at the time, such an event could have meant the end of capitalism not just in Europe, but everywhere. Additionally, the Comintern, founded in March 1919, began as an independent international organization of communists from various countries around the world that evolved after the Russian Civil War into an essentially Soviet-sponsored agency responsible for coordinating the revolutionary overthrow of capitalism worldwide.
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With the prospect of world revolution so close at hand, Marxists were dominated by a feeling of overwhelming optimism, which in the end proved to be quite premature.