Pacific Theater: The Battle of Midway in the pacific due to the fact the Midway offered a strategic advantage to whichever side controls it. If the Japanese took midway, I think history would have played out very differently with a possible land invasion of Hawaii, and even mainland USA. Thanks to our intelligence network though, we were able to thwart the Japanese plan and take the fight to their country.
European Theater: In Europe, I would point towards the D-Day invasion because it was due to its success that German influence was reduced on both the Western and Eastern sides of Europe. Another example which works in tandem with the D-Day invasion. could be the failed invasion of Russia by Germany as it brought Russia into the war from the east and allowed the Allies to push the Germans back on both the eastern and western side into Germany and ultimately Berlin.
The answer i think is right A.
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The machines are called steam engines, which, with external combustion engines, work to convert the thermal energy (the force of heat) of the boiling water into mechanical energy.
The heat resulting from the burning of certain amounts of coal boils the water that turns into steam. That steam is captured and directed to feed a series of elements that start the machine.
Thomas Newcomen invented the steam engine in 1705. With the help of colleagues such as physicist Robert Hooke and mechanic John Calley, Newcomen was the first to make a steam engine proper.
Some years later it was used as a basis for several of the most important inventions of the Industrial Revolution, such as the locomotive, steam ships and factories, among other things.
The steam engine and coal revolutionized production in the factories, both objects were one of the drivers of the industrial revolution.