No. Depressions typically get better and eventually recede to just simple recessions, but recessions (like the one of 2008) don't necessarily always get bad enough to be classified as a depression.
Arabic numerals were brought to Europe around 1500, when they sparked scientific and mathematical innovation almost immediately.
The ottoman and austro-hungarian empires ruled eastern europe until the end of world war 1
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.
