The trend towards densely populated urban centers begun in 1800's continued into the 1900's. Man's development of urban centers was a major step away from what seemed to be nature's way of living: on farms and sparsely placed homesteads. Industrial production required hundreds of thousands of workers and, especially in the second industrial revolution, scientists. The urban centers that emerged during this period, such as Paris, London, and Berlin, were quickly changing the ratios of population from rural to urban Berlin's population, for example, went from 66% rural in 1871 to almost 66% urban before the first World War (see "The Second Industrial Revolution").
I can help with how it helps with life and farming. So every year the Nile used to flood before dams were built. and when it flooded brought many nutrients to the surface and over on to the farm surrounding the Nile, giving it very fertile soil.
I believe the answer is they were the first to trace the circulatory system.
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The Continental System hurt English industries and helped spur the Luddite protest movement against unemployment in England. Although it stimulated manufacturing in some parts of France, the system damaged regions dependent on overseas commerce. Because the British had an overwhelming superiority at sea, though, enforcing the system proved disastrous for Napoleon. His efforts to halt evasions of his blockade stretched French forces too thin, and ultimately provoked his calamitous invasion of Russia in 1812.
England responded to the Continental System with Orders in Council that subjected France and all countries in alliance with Napoleon to a counterblockade. These orders were one of the main causes of the Anglo-American War of 1812.
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