X Equestris
Maester
There's an issue of scale here, as well. Your world is infinite. Infinite. Bigger than galaxies, bigger than our observable universe. It's a size that humans would be unable to comprehend. The way you're describing it, the empire must be huge. The size of galaxies. Otherwise it's pretty much microscopic considering the scale of the world. So you need faster than light communications for this to even have a chance at working. And I find the idea that political bodies of a similar size haven't developed in an infinite world ridiculously improbable.