A civil war was forming in china that eventually left 10-30 people dead and the Chinese started to form their military also the wu-han virus started to take place.
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.
A. Mali because Mansa Musa was the conqueror of the Mali empire