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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The answer to this question is A agriculture :)
Mckinley would be the person
Enlightenment thinkers wanted to improve human conditions on earth rather than concern themselves with religion and the afterlife. These thinkers valued reason, science, religious tolerance, and what they called “natural rights”—life, liberty, and property. So A
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