Determine relevance how did the crusades accelerate change in europe?

The Europeans were exposed to new technologies, inventions, and ideas as well as old ones that had been lost and forgotten in Europe for centuries. The arrival of Muslim innovations in medicine and science helped Europeans catch up to the rest of the world. Politically, many leaders left Europe to focus on the crusades and were unable to respond to uprisings in their homeland or appointed others to rule in their absence. The crusades eroded the power of the feudal aristocracy and elevated the role of kings. The Papacy became more powerful and it's church became much wealthier. International trade increased and there was a new demand for foreign goods. It also reawakened Europe's curiosity, driving them to discover and explore new places, create new inventions, and innovate new ideas.

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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.