Photos show how FDR's 'tree army' helped shape America's national parks — and how the NPS has changed since

The National Park Service, created by President Woodrow Wilson on August 25, 1916, celebrated its 110th anniversary. The agency now employs 12,600 full-time workers and manages 85 million acres with a multibillion-dollar budget. Before its creation, federal lands were managed by multiple agencies with minimal coordination. Recent budget cuts have threatened the NPS's ability to maintain operations and visitor services.

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