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The Ceratopsoid dinosaurs were incredibly diverse and common animals throughout the Cretaceous period. However, despite what I just said, the group is incredibly weird compared to pretty much every other dinosaur group during the Cretaceous period for how relatively isolated they were. They are pretty much only known from the western half of North America - from Alaska to Mexico. Only one member of the advanced Ceratopsoidea is known from Asia, and none from any other continent. I preempted the last statement with “pretty much” because there were other types of early horned dinosaurs living across Eurasia and there are tantalizing hints of some in the eastern half of North America - however, these critters diverged from the horned dinosaur group long before forms such as Diabloceratops or even the much later Triceratops. Most other groups of dinosaurs during this period of time were present across many continents. Hell, even the Titanosaurs - once considered South American endemics - were present worldwide. Why this is has a lot to do with geography and evolutionary pressures, but we’re not here for this today.
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Brown, Caleb M.; Henderson, Donald M. (June 4, 2015). "A new horned dinosaur reveals convergent evolution in cranial ornamentation in Ceratopsidae". Current Biology. 25 (12): 1641-8. doi:10.1016/j.cub.2015.04.041. PMID 26051892.
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