What are 5 different sources of primary sources of history

What are new social classes emerged due to advancement in agriculture ?

How did the russian revolution impact world war i? a) the russians required the allied powers to come to their aid and defeat the radical groups. b) the russians pulled out from the war, enabling the germans to focus on the western front. c) the russians created new technological advancements that were used by the allied powers to win. d) the russians created a new communist government that aligned with the central powers instead.

Define what the expropriation without compensation's and what does the freedom charter says about it