What was henry bessimer and his contribution?

Sir Henry Bessimer was an inventor and engineer. He developed the original process for manufacturing steel inexpensively. It later lead to the development of the Bessemer converter. He had a major impact on Industrial Revolution. If it were not for him we may still be using cast iron and offsets of unrefined iron. His ideas also helped with the creation of heating the molten cast iron, and removing impurities.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

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