How did andrew carnegie spend his great fortune after he sold his business?

Andrew Carnegie was an American industrialist, businessman and philanthropist from Scotland. As a child, he emigrated from Scotland with his parents. He worked from a very young age on the Pennsylvania Railroad Company. At age 20 he became manager of the same railroad company and apprentice of Thomas A. Scott, owner of the Company. He created the Carnegie Steel Company in Pittsburgh, which later merged with the Federal Steel Company of Elbert H. Gary and with several smaller companies to create U.S. Steel. The fortune he earned from his businesses was spent on philanthropy and education, founding the Carnegie Corporation of New York, the Carnegie Endowment for International Peace, and Carnegie Mellon University in Pittsburgh.  

Although Carnegie paid its employees the typical low wages of that time, he then donated most of his money to finance various libraries, schools and universities in the US, the United Kingdom and other countries, as well as to create pension funds for employees of more antiquity. He also dedicated money to philanthropy on local libraries, world peace and scientific research.

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why not?