Montana was admitted to the Union on May 29, 1848 (same as Rhode Island, though a different year.) It’s a great big plot of land, including a lot of Rockies, with many features and residents of interest.
The ‘X’ marks the Badlands, where there used to be a lot of Dinosaurs living. We know this because there are a bunch of bones to testify. Looking into this is called Paleontology, or something very close to that.
In case you noticed similarities, Rhinos are not related to Triceratops; by the time Rhinos came along, the Dinosaurs were all gone. But even We can’t help wondering, one way and another.