Believe me, I'm very much inclined to keep their differences for a very long time, maybe even include a war or wars of the halves.
Also, Erinaum offered them the ability to govern themselves under a republic in New Yaslovakia as opposed from the dictatorship that they were from. I massacred them because they became unruly, and were demanding a republic that Erinaum had already provided for them, but old Yaslovakia would not provide. It was preposterous that they wanted to return to a government that oppressed them, rather than gave them freedom. They were a protectorate of Erinaum- not even assimilated into any polar federation. Erinaum had a few officials in place at the beginning, and that was it, until the rebels had sealed their fate and the fates of many of their brethren.