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.
Miami because there is 5,673,185 Cubans
The answer to this is federalism
b.) powers that allow the each branch to curb the others