The correct answer is B.
The development of cheap iron in the US was the major factor that lead to the building of skyscrapers. Being able to produce iron cheaply can be contributed to Andrew Carnegie. This American business mogul perfected the Bessemer process in several factories across the eastern part of the US. From there, he was able to sell cheap iron to American businesses for the purpose of growing their empire.
The coalition of various reform groups was called the Young Turks.
Smith is also known for creating the concept of gross domestic product (GDP) and for his theory of compensating wage differentials. 2 According to this theory, dangerous or undesirable jobs tend to pay higher wages as a way of attracting workers to these positions.
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Answer is D.
Germany out of those 4 countries had the most dramatic territorial changes during that time period.
