Having made his fortune in steel, who is often referred to history's biggest philanthropist?

Amassing his fortune by founding Pittsburgh's Carnegie Steel Company, Andrew Carnegie is said to be one of history's greatest – if not the greatest – philanthropist of all time. Carnegie gave away ninety percent of his fortune in the last two decades of his life and wrote an article called "The Gospel of Wealth," in which he urged other rich folk in society to do the same.

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