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.
The crusades were considered a turning point in history because the pope urban 2 wanted the christians to fight the muslims so that they could have back the control over the holy lands
Da Vinci has influenced inventors even to this day. He has some of the earliest known plans and prototypes for parachutes, diving suits, and a form of a battle tank. His plans have increased the amount contributions to modern inventions. Now in his time I don't know much.
Answer:
(B) Slavery, banned by the Mexican constitution, must not be practised.
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