Since regaining independence, Madagascar has transitioned through four republics with corresponding revisions to its constitution. The First Republic (1960–72), under the leadership of French-appointed President Philibert Tsiranana, was characterized by a continuation of strong economic and political ties to France. Many high-level technical positions were filled by French expatriates, and French teachers, textbooks and curricula continued to be used in schools around the country. Popular resentment over Tsiranana's tolerance for this "neo-colonial" arrangement inspired a series of farmer and student protests that overturned his administration in 1972.