With a summit elevation of 20,320 ft (6,194 m), Alaska's Mt. McKinley is the tallest mountain in North America. James Wickersham led the first recorded climbing attempt in 1903 but turned back at 8,000 ft (2,438 m). In 1910, a group known as the Sourdough expedition claimed to have summited its lower, northern peak. Three years later, explorer Hudson Stuck and three others made the first successful ascent of the South Summit—its true summit. How did Stuck's ascent verify the Sourdough climb?
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