This is followed by independence in 1960, after which it becomes a one-party state led by president Hamani Diori and the PPN. Extreme drought in the early 1970s leads to a coup in 1974, resulting in a military dictatorship under Seyni Kountché and since 1987 Ali Saibou. Saibou's efforts to control political reforms fail in the face of union and student demands to institute a multi-party democratic system. Saibou forms the Mouvement National de la Societé de Développement (National Movement of the Development Society, MNSD) as his political vehicle.
The Saibou regime acquiesces to these demands by the end of 1990. New political parties and civic associations spring up and a national conference is convened in 1991 to prepare the way for the adoption of a new constitution and the holding of free and fair elections. Elections are held in 1993, bringing Mahamane Ousmane of the centrist Convention Démocratique et Sociale (Democratic and Social Convention, CDS) to power. Rivalries within the ruling coalition lead to governmental paralysis, which provides Ibrahim Baré Maïnassara a rationale to overthrow the Third Republic in 1996. He organizes and wins a flawed election in 1996, in which he is a candidate of his Union Nationale des Independants pour la Renoveau Democratique (National Independents Union for Democratic Renewal, UNRID).
In 1999 Baré is overthrown in a coup led by Daouda Mallam Wanké, who establishes a transitional National Reconciliation Council to oversee the drafting of a constitution for a Fifth Republic with a French style semi-presidential system. In votes that international observers found to be generally free and fair, the Nigerien electorate approve the new constitution and holds legislative and presidential elections in 1999. Heading a coalition of the MNSD and the CDS, Mamadou Tandja of the MNSD wins the presidency.