This recent question made me wonder about the scale of fantasy worlds.
My setting is mostly a scifi/fantasy mixture, so the size of the locations are very well defined, while the impact of it on the inhabitants...not so much.
Let's start with the assumption that a kingdom is founded on an entirely uninhabited planet. The scale is most likely hundreds of millions of square kilometers.
In most cases, and slightly sticking to reality, the most predictable outcome is an enormous wave of explorative "mission" of some kind, slowly but steadily increasing the area of presence (but not necessarily area of interest) of people.
However, on small time scales, and especially with the presence of magic, and other factors, it may prevent the rise in technology humanity lived through during the Age of Explorations. In other worlds, globalization may not happen.
Without that, what factors contribute to the decision that whether the society as a whole collapses, or ultimately still can become somehow globalized?
(Note: I guess Shingeki no Kyojin might be a great example for the former, at least for the "why they haven't globalized yet" scenario)