I found this difficult to follow with an overwhelming number of concepts, names, cultural ideas, and historical and political divisions being introduced very rapidly. Compounding the issue, the shifts between different perspectives (3rd-person omniscient to historical account to history text) were too abrupt and too frequent.
There's a time and a place to introduce a fully fleshed-out and unique culture in its entirety, and a 1000-word short story is neither the time nor the place. I would suggest that a piece of this length stick to a single perspective - or, at most, two - and as much as possible use old words to describe new concepts.
That said, I think the culture you've created here is an interesting one, and in a novella or full-length novel which has the time and wordcount to pace its introductions to that culture and its history, I'd love to explore it. There are some great turns of phrase in the piece as well. I really liked "enjoying the silence of absent artillery".