the two original cultures are farming communities which have finally achieved a form of unity and central government, roughly at the same time. They fight on a constant basis, and in the end destroy each other.
The grand farm fields which were eventually used to produce food for the major cities are overgrown when they fall, which is in part what the above poem is covering.
When I said "this is the first of..." I should have said "this is the first written poems of a series; and will be the fourth in a series of seven":
1) creation and destruction of Uram tower
2) building of the two nations
3) Tercelti war west of the kingdom, and the short-lived non-aggression pact
4) Dying Cultures (done)
5) Dark Ages
6) Founding of the New Kingdom
7) Ascension of the main character's Family 3 generations before start of books.
So this poem isn't all that descriptive of the cultures themselves, I'm working that into the earlier poems (which are currently steaming piles

).
thanks for the response; where are the breaks that you are seeing? Should I try and add a bit more specific information as to the fall itself, or does the tone convey the idea enough?