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elevators and skyscrapers
For starters, "Constructed of the best materials designed after the simplest designs that modern engineering can devise" is not a complete sentence at all, but is just a clause. Additionally, with no punctuation it is very difficult to comprehend.
Steel made it possible to build Skyscrapers. Answer "construction of skyscrapers"
the elevator!
The answer must include that before skyscrapers, men built what at the time were considered "very tall" buildings between 4 and 10 floors high. They put elevators into these smaller "very tall" buildings. When skyscrapers came later, the concept of elevators simply went along with the concept of extremely tall buildings that tried to reach the sky. So, technically, elevators came before skyscrapers, in numerous small and large towns with what was then "very tall" buildings that were only a fraction of the size of skyscrapers.