SEPARATION OF POWERS AND CHECKS AND BALANCES IN CONSTITUTIONAL GOVERNANCE: COMPARATIVE LESSONS FROM NIGERIA, THE UNITED KINGDOM, AND THE UNITED STATES

Abstract

The doctrine of separation of powers plays a vital role in constitutional democracy by allocating specific governmental responsibilities across three distinct arms: the executive, the legislature, and the judiciary. Embedding this concept into the legal system helps prevent the concentration of authority within a single official or body, curbing executive abuse and fostering effective governance. Although simple in definition, the doctrine does not function as an absolute or watertight division of power in practice. This study presents a comparative analysis of how separation of powers operates across three distinct constitutional environments: Nigeria and the United States, both operating under written constitutions, and the United Kingdom, operating under an unwritten constitution, placing attention on the relationship between the executive, legislative, and judiciary. The paper finds that separation of powers allows each branch of government to perform its primary or core functions; however, it recommends stringent checks to preserve the age-old doctrine and constitutional democracy. The article also emphasizes that effective separation of powers does not only depend on constitutional provisions but also on strong institutions and accountability.