<span>B. Soviet Union
The Soviets were attacking from the East, though the cost of their progress was also extremely high in terms of men and materials. </span>
Designating additional land as national parks
Electric power began displacing steam power as the major power resource for industries during the Second Industrial Revolution, a period starting around 1860. Edison and many other innovators, including Guglielmo Marconi and Heinrich Hertz, helped to discover electricity's capacity to transmit information and sound.