[Answer] Which U.S. president declared Yellowstone as the nation's first National Park?

Step 1 : Introduction to the question "Which U.S. president declared Yellowstone as the nation's first National Park?"

...Yellowstone came to the attention of Congress in 1871 through the work of explorers. Using the precedent-setting Yosemite Act of 1864 that established Yosemite as a state park in California, Congress drew up a bill designed to protect the Yellowstone region from development and settlement. Congress established Yellowstone National Park in 1872. President Ulysses S. Grant signed the Yellowstone National Park Protection Act into law that same year. Source: NPS.gov

Step 2 : Answer to the question "Which U.S. president declared Yellowstone as the nation's first National Park?"

Ulysses S. Grant:

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