[Answer] What was the first official U.S. national park?

Step 1 : Introduction to the question "What was the first official U.S. national park?"

...Signed by President Ulysses S. Grant, the Yellowstone National Park Protection Act designated over 2 million acres of northwestern Wyoming as a preserved area. Today it’s known for its scenic mountains, lush forests, hot springs, and geysers, including “Old Faithful,” which has erupted many times per day since its discovery in 1870.

Step 2 : Answer to the question "What was the first official U.S. national park?"

Yellowstone:

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