Why did military despotism disintegrate relatively quickly?

This can be explained by the fact that such military despotism or, in other words, empires were built on wars. Such wars enslaved the conquered peoples. Despite the fact that such empires were strong in the army, they were weak on the inside. Thus, if there was discord in the country or the government gave weakness, a wave of uprisings immediately occurred, which led to a split and to the disintegration of such a despotic state.