By May 29, 2019, Nigeria’s Fourth Republic and democracy had achieved an unprecedented 20 unbroken years of active partisan politics and representative democracy. The First Republic had lasted barely three years (1963-1966); the Second Republic and its democratic institutions lasted just four years (1979-1983) while the Third Republic (19921993) could barely hold its head for one year. Hence, by mid-2019, not many analysts have congratulated Nigeria for its longest democratic experience since its independence from Britain in 1960, but hardly did any of them identify the core reasons for such a sustained rule of democratic ethos for two decades. In this paper, we show the origin and practice of political parties in Nigeria. We argue that the country had succeeded in its Fourth Republic as a democratic country because its law and constitution together with the political culture of the people had permitted multiparty democracy by which governments had been formed, political inclusion and popular participation ensured, and public policies initiated. We also present an analysis of party politicking in the country from its beginning in 1923 and conclude that Nigeria has achieved meaningful and sustainable dividends of democracy in her Fourth Republic because of a maturing culture of partisan politics.