Final Answer:
The Sierra Club is credited with being the first environmental organization to play an important role in American politics.
Step-by-step explanation:
The Sierra Club, founded in 1892 by John Muir, is renowned for its pioneering role in environmental advocacy and its significant impact on American politics. The organization was instrumental in raising awareness about the conservation of natural resources and the establishment of national parks. One of its key achievements was the successful campaign to protect the Yosemite Valley in California. Over the years, the Sierra Club has actively engaged in environmental policy and politics, contributing to the development of important legislation, including the creation of the National Park Service and the passage of the Clean Air Act and Clean Water Act.
In summary, the Sierra Club is a trailblazing environmental organization that played a foundational role in shaping environmental politics in the United States.