What caused tension between the upper middle class and the
aristocracy?

In all areas of western Europe, the aristocratic class gained economic and ... Indeed, this conflict played an important role in the French Revolution at the end of the ... two major classes found enough common ground and common cause to work ... represents a prosperous gentry couple in the middle of the 18th century.

Explanation:

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industrial revolution, in modern history, the process of change from an agrarian and handicraft economy to one dominated by industry and machine manufacturing

polisit can also mean a body of citizens. in modern historiography, polis is normally used to indicate the ancient greek city-states, like classical athens and its contemporaries, and thus is often translated as "city-state". the body of citizens came to be the most important meaning of the term polis in ancient greece.