was a Marxist theory developed by Leon Trotsky in the early 20th century. The theory argued that socialist revolution needed to occur on a global scale, rather than being limited to individual countries. According to Trotsky, socialist revolutions needed to spread from country to country in order to create a successful socialist society. The theory is significant because it challenged the traditional Marxist view that revolution should occur first in the most advanced capitalist countries. Trotsky's ideas influenced the development of left-wing politics in the Soviet Union and beyond. Significant Decade/Era: 1900s-1920s.

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