Final answer:
Andrew Carnegie invested millions of dollars into philanthropic efforts such as public libraries, scientific research, and educational institutions, driven by his belief that the wealthy had an obligation to contribute positively to society.
Step-by-step explanation:
Andrew Carnegie, after amassing a considerable fortune during his time as a steel magnate, dedicated a large portion of his wealth to various philanthropic causes. Adhering to his belief as outlined in The Gospel of Wealth, he felt it was the duty of the wealthy to serve as benefactors to society. Carnegie's donations were aimed at supporting learning and reducing suffering; he funded the creation of public libraries, supported scientific research, and after his death, left behind ninety percent of his fortune to continue these efforts.
Despite the mixed reactions from former employees and contemporaries regarding his business practices, Carnegie's philanthropy was significant. His contributions extended beyond libraries to include schools, institutions of higher education, and other charitable works. His legacy as a philanthropist is a testament to his belief in the responsibility of the wealthy to enrich society.