The crusades start a chain of events that led to European discovery of the new world, they blocked trade routes between Europe and Asia and prevented skills and spices from reaching Europe.
European sailors began to use the Arabic compass and astrolabe to search out better sea routes for his or her journeys. Eventually this led to the discovery of the New World.
This heightened level of trade led to the expansion of cities and towns. Among the cities especially affected were the Italian city- states.
Crusading in northern and eastern Europe led to the expansion of kingdoms like Denmark and Sweden, similarly because creation of new political units, as an example in Prussia.
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