The paper examined governance in Nigeria since 1914, and look at how the executive, legislatures, and the judiciary operate in the country, indeed, the three arms of government are believing to operate as a watchdog to each other. This study is qualitative, the researcher obtained all the relevant and related data from the documented material, the research designed for this paper is a case study approach, it also helps in providing an in-depth understanding of a case where the researcher digs deeply into a phenomenon in obtaining the related literature. To support the paper the researcher adopted pluralism theory to explain the write-up. The postulation of the theory is to examine political actions in modern democratic states. The study found that the northern and the southern region were amalgamated by the British administration for their personal and economic gain, without considering the complex nature heterogeneity nature of the nation. This has created several problems across the nation. Therefore, the study recommended that for peaceful democratic governance all the three arms of government shall have autonomous power to discharge their constitutional responsibilities. No, any arm shall exercise the powers of the other. Again, for Nigeria to live in peace and harmony, and to attain national and economic development there is a need to accept the principle of unity of purpose.