"All his adult life [John] Muir had been warning about cities and preaching the outdoors. . . . Finally, in his sixties, he found the public more receptive to his message, even forcing him to write, 'Though I never intended to write or lecture or seek fame in any way . . . I now write a great deal and am well known.' . . . [H]is belated prominence derived more from the surging nature cults of the day than from any personal zeal to publish and be famous. No one else combined such a direct knowledge of the wilderness with such an agreeable literary style. Thus Muir functioned as a powerful symbol of widespread cultural yearnings."— Stephen R. Fox, historian, The American Conservation Movement: John Muir and His Legacy, 1985The idea conveyed in the excerpt serves as evidence of which of the following occurring in the United States at the time?

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