On February 26, 1919, President Woodrow Wilson signed a law turning a giant, jaw-dropping crack in the Arizona desert into Grand Canyon National Park. The canyon itself was already millions of years old, carved bit by bit by the muddy Colorado River cutting through rock layers. It stretched 277 miles long, up to 18 miles wide, and a full mile deep, with sunset-colored walls of red, orange, and pink stone stacked in stripes like a giant geology textbook.
Native peoples like the Havasupai, Hualapai, Hopi, and Navajo had lived in and around the canyon for thousands of years. Spanish explorers stumbled on its edge in 1540 and quickly turned back, defeated by the steep cliffs. Centuries later, a one-armed Civil War veteran named John Wesley Powell rafted the wild Colorado River through the canyon in 1869, mapping it for the first time. As trains brought tourists, President Theodore Roosevelt visited in 1903 and famously said, 'Leave it as it is. You cannot improve on it.' Roosevelt protected it as a national monument in 1908, but it took another 11 years for Congress to make it a full national park.
Today around six million people visit the Grand Canyon every year. They peer over the South Rim, ride mules down the dusty Bright Angel Trail, raft the rapids, and gaze up at incredibly dark skies full of stars. Condors with 10-foot wingspans glide above the cliffs. Every layer of stone tells a chapter of Earth's story, going back nearly two billion years. That one signature in 1919 helped make sure those layers stay there for many more.
