[Answer] Which of these is the oldest national park in the US?

Step 1 : Introduction to the question "Which of these is the oldest national park in the US?"

...1. Yellowstone National Park
2. Hot Springs National Park
3. Big Cypress National Preserve
4. Chaco Culture National Historical Park

Step 2 : Answer to the question "Which of these is the oldest national park in the US?"

Yellowstone National Park:

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