What does it mean when it says revolution by the underclass is inevitable?

Which general's wife provided food and comfort during the winter at Valley Forge? When was Pericles elected war general? What document did king John sign that limited the power of monarchs in 1215? Who was the second baseman for the New York Yankees in 1978? Who made Prussia powerful by enlarging their army? What are the differences between the Middle Ages and the Renaissance? What was Mesopotamian's race? When did shogunate begin in japan? Was the first olympic game in Greece or Rome? Who do the witches say will not be a king himself but will be the father of kings? Did the British empire take over 53 countries? What did Geroge Washington warn political parties would do? Which was not a characteristic of the industrial magnates of the late nineteenth century? Did plebeians get to vote for a lifetime? What is sir francis drake most remembered for? Why did early civilization settle in river valleys? What did the native do when the saw Columbus? What did they do after the Organ trail? What were Ancient Mesopotamian shields made out of? Is 20 knots fast for a submarine in world war 2?