This is the subsector in the timeperiod of D20 Traveller (T20). This is a little after the end of the Third Frontier War. As the main focus of T20 is the Gateway Quadrant (Ley, Gateway, Glimmerdrift and Crusis-Margin sectors), I doubt they will release anything on the Spinward Marches; at least not for quite a while. The only piece of information on this time period are some sector dot-maps in the Spinward Marches Campaign showing the politcial disposition before and after each Frontier War. While the focus was, of course, on the growth of the Zhodani and Imperium, the Daryens and Sword Worlds were also shown. So, while the territory is canon, all world information is, as with the information in Year 0, pure speculation.
The Darrian Confederation had a very good period
from 788 to 1084 (this map is pretty much good for the entire period).
In 788 the Darrian Confederation launched a lightening quick war on the
Sword Worlds to retake the Entropic worlds. In 1084, as the Fourth
Frontier War drew to a close, the Sword World Confederation attacked the
Darrian Confederation and retook the Entropic worlds. Between these
two wars, the Darrian Confederation enjoyed a very stable environment.
They even managed to completely avoid any involvement in the Third Frontier
During the First and Second Frontier Wars the Darrian Confederation contracted with many Aslan ihatei groups for work as mercenaries. In payment for these services, they were given land grants after the Second Frontier War. About half of the Aslan wished to maintain their own culture and settled on the then sparcely populated world of Roget. The other half chose to spread out and take land grants over several planets: Zamine, Engrange, Ektron and Daryen itself.
The existing human inhabitants of Roget were far from pleased by the deal, but the Confederation wouldn't change the deal and gave the inhabitants of Roget a choice: stay and live under Aslan rule or leave with a government sponsored Voucher. While there were many who took the Confederation up on its offer and left, most just grumbled and decided to stay. After a rocky start, most of the humans adjusted to Aslan rule and, while shut out of the governmental system, still live fairly well.
While external observers may view these 300 years as a "dormant" or "static" period for the Confederation, that was far from the case. They were busy expanding their economic frontiers and increasing their technology.