response: I'm not sure but the oldest one, Yellowstone, was created in 1872.
original_response: Well, there are a lot of popular ones.  I would say Yellowsstone is the most popular since it is the oldest!  It was established 1872.
history: I would love to visit a national park in the United States. There are 59 national parks choices for you then. Which parks are the most popular parks for tourist?
knowledge: A bill creating the first national park, Yellowstone, was signed into law by President Ulysses S. Grant in 1872, followed by Mackinac National Park in 1875 (decommissioned in 1895), and then Rock Creek Park (later merged into National Capital Parks), Sequoia and Yosemite in 1890.