Answer:The invention that is credited with having the greatest impact in starting the second Industrial Revolution is the Bessemer process for the mass production of steel. The Bessemer process, invented by Henry Bessemer in 1855, greatly reduced the cost of steel production by using a blast of air to remove impurities from iron, making it possible to produce large quantities of high-quality steel at a low cost. This led to the widespread use of steel in construction and manufacturing, which in turn led to the growth of many new industries, including transportation (railroads, steamships, and automobiles), construction (bridges, buildings, and infrastructure), and manufacturing (machinery, tools, and equipment). The development of the Bessemer process also made it possible to produce other important industrial materials such as aluminum, which were previously too expensive to produce on a large scale.
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