The antonyms for the phrase "most self-ruling" could be "least independent," "least autonomous," or "most dependent." These antonyms refer to a state where someone or something is not capable of exercising complete control over their actions, decisions, or direction. The opposite of self-ruling is a condition where one is subject to someone else's authority or control. In the context of larger entities such as countries, the antonyms could be "dictatorship," "authoritarianism," or "oligarchy." The antonyms are words that undermine the spirit of freedom and democracy, and they remind us that we must work tirelessly to preserve our self-ruling states at all costs.