Was it the first national park?

No. Yellow stone is the first NP

No, Yellowstone was in the 1870s

I can't add anything else to what these gentleman have already have stated in there comments before me. What they stated is accurate, true to there word.

Zion National Park was established on November 19, 1919. It is part of Utahs 'Mighty 5 Parks' including, Zion National Park, Bryce Canyon National Park, Arches National Park, Capitol Reef National Park and Canyonlands National Park. It features 2 incredible hikes known as Angels Landing and the Narrows. This is 1 of 58 National Parks but certainly not the 1st

Yellowstone was the first national park,it was in 1872