context: Excessive grazing on pastures (mainly sheep), felling of sequoiadendron trees and other activities to the detriment of nature forced John Muir to come up with the idea of ​​tightening the conditions for the protection of this territory. Muir convinced influential visitors of the need for federal protection of the park. One such visitor was Century Magazine publisher Robert Johnson (English: Robert Underwood Johnson). With the help of Johnson, Muir helped carry out an act of Congress, which October 1, 1890 gave the park national status. Despite this, the state of California still retained control of the valley and the grove. Muir also convinced local authorities not to graze cattle in alpine meadows.
question: When was Yosemite National Park founded?
answers.text: October 1, 1890