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===Summary===

The Black Death affected many societies of the Old World in the 14th century, where it reoccurred in subsequent centuries as the disease never entirely went away. However, its effect was different in various regions, leading to some societies to benefit by gaining political and social freedom, while others collapse or populations became more controlled by ruling classes. The Black Death allowed the world to develop differently and ultimately change the course of history. Western Europe and the Ottomans gained increasing power as a result of the Black Death, which may have never happened otherwise. In Western Europe, individual liberties and its development may have been one byproduct as well.