Since the roots of these are both before 1900, it's quite justifiable putting this here even though its full effects will be felt later. I'm not too sure precisely how modern capitalism started or when, or what is meant by it (does it involve the system of bankingand financngventures? Or is even old-fashioned trade and tradesmanship counted as some form of capitalism?) Would communism indeed have started, in the sense of Marxist ideology, if there was no situation regarding workers in an industrial society? What alternatives might speculatively be possible (either resulting from a specific POD or not*)? Would we still be seeing a mainly agrarian society? Could industrialisation take place without capitalism?
*Would not doing so mean veering into ASB territory?