How was their prediction of communist revolutions played out in the real world events?

The prediction of communist revolutions, particularly by Marx and Engels, materialized in the 20th century with notable events such as the Russian Revolution of 1917, which led to the establishment of the Soviet Union. Other significant revolutions inspired by communist ideology occurred in China, Cuba, and various countries in Southeast Asia and Latin America. However, the anticipated global wave of proletarian revolutions did not unfold as expected, with many communist movements facing significant challenges, leading to mixed outcomes. Ultimately, the collapse of the Soviet Union in 1991 marked a significant decline in the influence of traditional communist ideologies worldwide.