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They include a series of various biological, social, economic, political and religious upheavals which had profound effects on the course of world history, especially European history. Often referred to as simply "The Plague", the Black Death was one of the most devastating pandemics in human history, peaking in Europe between 1348 and 1350 with an estimated one-third of the continent's population ultimately succumbing to the disease. Historians estimate that it reduced the total world population from 450 million to between 350 and 375 million.

japan is located on a chain of islands called an archipelago. it is made up of four main islands and thousands of smaller ones. the terrain is mountainous, which means there is not a lot of good land for farming. because of the geography, the japanese relied on the sea for many aspects of daily life.

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