History of U.S. National Parks: From Yellowstone to Today

America's National Park System: Origins and Growth

The world's first national park, Yellowstone, was established on March 1, 1872 by President Ulysses S. Grant. Since then, the system has expanded to over 400 units managed by the National Park Service (created 1916).

Key Milestones

• 1872: Yellowstone National Park (WY/MT/ID)
• 1890: Sequoia & Yosemite (CA)
• 1906: Antiquities Act → presidential power to create national monuments
• 1916: National Park Service Organic Act
• 1933: Reorganization adds historic/military sites
• 1980: ANILCA adds 100M+ acres in Alaska

Types of Units

National parks, monuments, historic sites, battlefields, seashores, recreation areas, preserves, parkways, and more—all under NPS management.

Today, the system protects ~85 million acres across all 50 states and territories, preserving natural, cultural, and recreational resources for future generations.