response: I see, did you also know that 6 national parks in Alaska and 1 other are paired with national preserves?  The areas have different protection levels but administered together.
original_response: You'd probably have to travel across the entire continental US, and then to Alaska because six national parks are there alone!
history: Have you ever visited Yellowstone National Park? It's a cool place! I haven't but it was the first national park signed into law through President Ulysses S. Grant during 1872. That's very true. Tedy Roosevelt also had a lot to do with National Parks too  I believe. I didn't know Ted Roosevelt was involved, but I do know that the US has 59 national parks that the National Park Service operates in. Yeah I think it would be really cool to visit them all but that's a lot of ground to cover!
knowledge: Seven national parks (including six in Alaska) are paired with a national preserve, areas with different levels of protection that are administered together but considered separate units and whose areas are not included in the figures below.