Conclusion
Thesis: John Muir, a passionate naturalist and early environmentalist, played a key leadership role in the formation of the National Park system, which through Theodore Roosevelt's endorsement, created an even greater legacy.
John Muir was a key figure in the history of preservation. Through Theodore Roosevelt's endorsement, he created many National Parks. He devoted his life to saving natural spaces, and to spread his message, wrote moving articles about nature, and the importance of its preservation.
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