John D. Rockefeller (1839–1937) and Andrew Carnegie (1835–1919). Nationwide monopolists of this type applied Darwin's concept of natural selection to explain corporate dominance in their respective fields and thus to justify their exorbitant accumulations of success and social advancement. Rockefeller, for example, proclaimed: "The growth of a large business is merely a survival of the fittest...the working out of a law of nature and a law of God." Robert Bork (1927–2012) backed this notion of inherent characteristics as the sole determinant of survival in the business-operations context when he said: "In America, the rich are overwhelmingly people—entrepreneurs, small-business men, corporate executives, doctors, lawyers, etc.—who have gained their higher incomes through intelligence, imagination, and hard work." Moreover, William Graham Sumner (1840–1910) lauded this same cohort of magnates, and further extended the theory of "corporate Darwinism". Sumner argued that societal progress depended on the "fittest families" passing down wealth and genetic traits to their offspring, thus allegedly creating a lineage of superior citizens. However, contemporary social-scientists repudiate such claims and demand that economic status be considered not a direct function of one's inborn traits and moral worth. In 1883 Sumner published a highly-influential pamphlet entitled "What Social Classes Owe to Each Other", in which he insisted that the social classes owe each other nothing, synthesizing Darwin's findings with free-enterprise capitalism for his justification. According to Sumner, those who feel an obligation to provide assistance to those unequipped or under-equipped to compete for resources, will lead to a country in which the weak and inferior are encouraged to breed more like themselves, eventually dragging the country down. Sumner also believed that the best equipped to win the struggle for existence was the American businessman, and concluded that taxes and regulations serve as dangers to his survival. This pamphlet makes no mention of Darwinism, and only refers to Darwin in a statement on the meaning of liberty, that "There never has been any man, from the primitive barbarian up to a Humboldt or a Darwin, who could do as he had a mind to." Sumner never fully embraced Darwinian ideas, and some contemporary historians do not believe that Sumner ever actually believed in social Darwinism. The great majority of American businessmen rejected the anti-philanthropic implications of Sumner's theory. Instead they gave millions to build schools, colleges, hospitals, art institutes, parks and many other institutions. Andrew Carnegie, who admired Spencer, was the leading philanthropist in