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Nathan Werth · Answer 1 · 2016-12-19T22:38:31+0000

stronger steel. You need stronger steel for the tall building to be supported better so they dont crash. lol i hope this helps

Kedar Tiwaskar · Answer 2 · 2016-12-23T02:31:12+0000

What finally enabled sturdy skyscrapers was sturdy steel, which is a mixture of metals and other elements, such as carbon, which is distinguished by low cost on one hand and strength and flexibility on the other.

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