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This Day in American History

April 21

1 historic event on this date

Movement1838

John Muir Born

John Muir was born in Dunbar, Scotland, and would immigrate to the United States as a child. He became the most influential advocate for wilderness preservation in American history, co-founding the Sierra Club and persuading President Theodore Roosevelt to protect Yosemite.

Why It Matters

Muir's advocacy helped establish the principle that the natural heritage of the nation belongs to all citizens and should be preserved for future generations through public stewardship.

Explore the Principles Behind the History

Every event in American history connects to the founding principles. Discover the ideas that shaped these moments.

View the 28 Founding Principles