Answer: Muir and Johnson lobbied Congress for the Act that created Yosemite National Park on October 1, 1890.
Explanation: Muir and Johnson lobbied Congress for the Act that created Yosemite National Park on October 1, 1890. The State of California, however, retained control of Yosemite Valley and Mariposa Grove. Muir also helped persuade local officials to virtually eliminate grazing from the Yosemite high country.