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How did Karl Marx and Friedrich Engels differ from Jean-Jacques Rousseau about socialism?

In the first half of the 20th century, the Soviet Union and the communist parties of the Third International around the world mainly came to represent socialism in terms of the Soviet model of economic development and the creation of centrally planned economies directed by a state that owns all the means of production, although other trends condemned what they saw as the lack of democracy. In the United Kingdom, Herbert Morrison said that "socialism is what the Labour government does" whereas Aneurin Bevan argued that socialism requires that the "main streams of economic activity are brought under public direction", with an economic plan and workers' democracy.[2] Some argued that capitalism had been abolished.[3] Socialist governments established the mixed economy with partial nationalisations and social welfare.

Explanation:

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.