However, the Mandalorian population isn't pacifist in the sense that they fully embrace pacifism. They're ready to embrace militarism at the drop of a hat. They still have security forces, weapons and enough of a military-industrial complex to indigenously produce armour, vehicles and weaponry. There are active ultranationalist groups like Death Watch in existence, and plenty of adept paramilitary fighters serving with them. The New Mandalorian government may fold like paper, but the population does not necessarily have to follow. If the CIS just strolled into power on Mandalore like you described, it could potentially face a much stronger resistance than what the Umbarans give the Republic in S4. The threat of having to wage a protracted, costly counter-insurgency campaign against nationalists at the height of galactic conflict is what seems to be deterring both the CIS and the Republic from moving against the New Mandalorian government, judging by how the situation is portrayed in TCW. It would give them a defensible position in which they'd almost always be on the defensive from the Mandalorian nationalists, and which would be weak enough for the other side to eliminate it with minimal effort. Also keeping the Republic from intervening is Mandalore's neutrality which, in practice due to the fact that recognising the legitimacy of the CIS would effectively be siding with it, means that Mandalore is de facto pro-Loyalist already. They certainly would like Mandalore and its fellow neutral systems to join the fight, but they're halfway tolerant of their neutrality as they're not actively Separatist. After the events of S2, the CIS seems to have given up on bringing Mandalore under its control by S4. Both sides would rather commit their resources elsewhere. Interesting comparison to the Yellow Turban Rebellion. TCW does closely mirror that. However, if the CIS or Republic tried this on the New Mandalorian government, they'd probably face a situation similar to the Boxer Rebellion. It was often harder to get Chinese commoners riled up about Chinese politicians and strongmen pushing their emperor around than it was to get them irate at foreigners doing the same. Same with the Mandalorians, some of whom deny that Maul legitimately defeats Vizsla even after the latter concedes. The Europeans, Japanese and Americans won that war against the Boxers and their Imperial allies, but they were not caught in the total global conflict of the world wars when they waged it.