I would also add attacks on Hellas-held Tyrrhena from the Aetolian Coast. Also, I think the fighting should go on longer, a year at least. It is supposed to be the Great War.At this moment, to both Dar-es-Salaam and Martian Commonwealth suprise, Elysium army arrived at force, attacking both in the bay, and on the coastal territories of Dar-es-Salaam alliance, pushing the Dar-es-Salaam to the defensive. After a three months of intensive fighting, Elysium progress inland stalled, and eventually, was entirely stopped once a plague strike hard on their overextended forces...
Maybe the Elysians received a 'prophecy' that made them realize that other two great powers were going to attack them anyway, and instead of relieving their colony, used that time to plan all-out invasion against Hellas and Dar-es-Salaam.Elysium didn't intervened, and bide their time while colonial government was left to crush the rebellion by their own devices, which mistakenly convinced rivalling powers that territory is a free for the taking.
I would also add 'aboriginal' people who were living in the area when Elysians conquered them.Those differences were also more pronounced by the fact that Isidis wasn't monocultural entity like Elysium, and its populace hailed from many different backgrounds, including Dar-es-Salaam and Martian Commonwealth, and following different faith or had no faith at all.
I am not sure if this is realistic or not. So no comment.Elysium never felt a need to remedy this particular issue, on one hand forcing the development towards certain areas, and on the other straight away ignoring a glaring issues with cultural and religious differences.