B. The Five Civilized Tribes
US Constitution i don't have 20 word to say so let me add my answer
Answer:
After 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.
Explanation:
