<![CDATA[The integrity of the Unitary State of the Republic of Indonesia (NKRI) is increasingly confronted by multidimensional constitutional challenges, including radicalism, globalization, regulatory disharmony, economic inequality, and weak central-regional coordination. These developments demonstrate that threats to national integrity are no longer merely territorial but have evolved into complex constitutional issues requiring adaptive legal responses. This study aims to analyze the strategic role of Constitutional Law in maintaining the integrity of the Republic of Indonesia and to formulate an integrative constitutional framework capable of addressing contemporary challenges. Employing a normative juridical method with statutory, conceptual, and comparative approaches, this research examines constitutional provisions, legislation, legal doctrines, and relevant scholarly works concerning constitutional supremacy, decentralization, and state defense. The findings reveal that the effectiveness of Constitutional Law is determined by the successful integration of three constitutional pillars: constitutional supremacy, decentralized governance, and state defense. Furthermore, this study identifies the absence of a comprehensive constitutional model linking these elements within the Indonesian legal system, resulting in fragmented policy implementation and reduced constitutional effectiveness. The novelty of this research lies in proposing a constitutional reconstruction model that positions constitutional supremacy, decentralization, and state defense as interconnected instruments for strengthening national resilience and preserving state integrity. Accordingly, Constitutional Law should be understood as a dynamic and adaptive constitutional instrument capable of safeguarding sovereignty, reinforcing social cohesion, and ensuring the sustainability of the Republic of Indonesia amidst contemporary constitutional developments]]>
