What fundamental element made government legitimate?

The fundamental element that makes government legitimate is the consent of the governed. This principle asserts that a government's authority derives from the approval and acceptance of its citizens, often expressed through democratic processes such as elections and referendums. When a government operates with transparency, accountability, and respect for individual rights, it strengthens its legitimacy and fosters trust among the populace. Ultimately, legitimacy hinges on the belief that the government acts in the best interests of its citizens.