 Muir and his Sierra Club continued to lobby the government and influential people for the creation of a unified Yosemite National Park . In May 1903 , President Theodore Roosevelt camped with Muir near Glacier Point for three days . On that trip , Muir convinced Roosevelt to take control of Yosemite Valley and Mariposa Grove away from California and return it to the federal government . In 1906 , Roosevelt signed a bill that did precisely that . 
