Wealthy businessmen of the Gilded Age who followed in the footsteps of Andrew Carnegie in donating their wealth included

John D. Rockefeller and Leland Stanford were wealthy businessmen who donated substantial portions of their fortunes to philanthropic causes, following the example of Andrew Carnegie. Charles Darwin was a naturalist, and William Gladden was a religious leader, not a Gilded Age businessman in this context. Therefore, the correct choice is John D. Rockefeller and Leland Stanford.

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