The constitution is the primary foundation for establishing a democratic state. As the highest legal norm, the constitution regulates the division of power, guarantees human rights, and limits government authority to prevent abuse of power. This study aims to analyse the role of the constitution in (1) establishing a democratic system of government and (2) maintaining the sustainability of democracy in state administration. This study uses a normative legal research method with a comparative approach. Research data are sourced from secondary legal materials, including constitutional documents, laws and regulations, legal literature, and relevant scientific publications. The analysis is conducted descriptively and analytically to explain how constitutional mechanisms support democracy. The results show that the constitution plays a crucial role in establishing a democratic government through the principles of popular sovereignty, separation of powers, checks and balances, and protection of citizens' basic rights. In addition, the constitution helps maintain democracy by promoting political stability, legal certainty, the protection of minority groups, and adaptive constitutional reform in the face of social dynamics and global challenges. Thus, strengthening the implementation of the constitution and its adaptability are key factors in maintaining democracy.
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