It was the refinement of the Bessemer process, first used in the United States in the 1860s, that allowed for the major advance in skyscraper construction. As steel is stronger and lighter in weight than iron, the use of a steel frame made possible the construction of truly tall buildings.
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Answer:
He is referring to Europe's penchant for imperialism
Explanation:
Imperialism is when one or more countries want to extend their own influence over other countries or regions either through land expansion or by strong cultural influence (sometimes both). Countries like Great Britain, for example, are significant models of this idea. Europe was a hotbed of imperialism and this led to many conflicts and wars.
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