Nigeria relatively little violence or voter fraud, in contrast to previous elections. In the March 2015 election, Muhammadu Buhari defeated Goodluck Jonathan by roughly 2 million votes. Observers generally praised the election as being fair. Jonathan was generally praised for conceding defeat and limiting the risk of unrest. Nigeria is a federal republic modelled after the United States, with executive power exercised by the President. It is influenced by the Westminster System model in the composition and management of the upper and lower houses of the bicameral legislature. The president presides as both head of state and head of the federal
Head of state they divide the leadership of the nation among themselves). In countries with parliamentary systems, the head of state is typically a ceremonial figurehead that does not actually guide day-to-day government activities or is not empowered to exercise any kind of political authority. In countries where the head of state is also the head of government, the head of state serves as both a public figurehead and the actual highest-ranking political leader who oversees the executive branch (e.g., the President of Brazil). Former French president Charles de Gaulle, while developing the current Constitution of France (1958), said the head of state