[orwin]

To be clear, Marx believed in the 'march of progress', basically that the constant struggle between classes during the middle age as well as the scientific revolution killed feudal society to give birth to capitalism (which is a very reductionist view of what happened, because the knowledge we had on feudal society then was _extremely_ skewed, but for the time it wasn't that crazy), and that the struggle between the capital class and the worker class will kill capitalism to create socialism (which isn't what is called socialism in Europe right now, it is closer to what European call communism), which is the last step before communism (basically a state of nature where everything goes so well you don't need the state. An ordered anarchy where everyone works for themselves and the society, without coercion from other people or entity). He use violent term (struggle), but never talked about a violent war or revolution, on the opposite, he took the French revolution as an example to avoid if I remember correctly (it has been more than a decade now. I'm old as fuck).

Some of his offshot do believe in a necessary war though. Leninism and Stalinism are the most famous one. Some of them take the US revolution as an example to follow.