Consequences of the Black Death included a series of religious, social, and economic upheavals, which had profound effects on the course of European history. The Black Death was one of the most devastating pandemics in human history, peaking in Europe between 1347 and 1350 with 30% to 65% of the population killed.
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In general, "A. Publishing articles" is not a necessary part of the historical thinking process, since this is usually done after a conclusion has already been drawn due to research.
I think he was 27.hopefully this helps
B. The entrance way (sorry if I am wrong)
The political and economic theories of Karl Marx and Friedrich Engels, later developed by their followers to form the basis for the theory and practice of communism.