France's presence in the western Indian Ocean dates to the early seventeenth century. The French established a settlement in southern Madagascar in 1634 and occupied the islands of Reunion and Rodrigues; in 1715 France claimed Mauritius ( Île de France), and in 1756 Seychelles. When France ceded Mauritius, Rodrigues, and Seychelles to Britain in 1814, it lost its Indian Ocean ports; Reunion, which remained French, did not offer a suitable natural harbor. In 1840 France acquired the island of Nosy-Be off the northwestern coast of Madagascar, but its potential as a port was limited. In 1841 the governor of Réunion, Admiral de Hell, negotiated with Andrian Souli, the Malagasy ruler of Mayotte, to cede Mayotte to France. Mahoré offered a suitable site for port facilities, and its acquisition was justified by de Hell on the grounds that if France did not act, Britain would occupy the island.

Although France had established a foothold in Comoros, the acquisition of the other islands proceeded fitfully. At times the French were spurred on by the threat of British intervention, especially on Nzwani, and other times, by the constant anarchy resulting from the sultans' wars upon each other. In the 1880s, Germany's growing influence on the East African coast added to the concerns of the French. Not until 1908, however, did the four Comoro Islands become part of France's colony of Madagascar and not until 1912 did the last sultan abdicate. Then, a colonial administration took over the islands and established a capital at Dzaoudzi on Mahoré. Treaties of protectorate status marked a transition point between independence and annexation; such treaties were signed with the rulers of Njazidja, Nzwani, and Mwali in 1886.

The effects of French colonialism were mixed, at best. Colonial rule brought an end to the institution of slavery, but economic and social differences between former slaves and free persons and their descendants persisted. Health standards improved with the introduction of modern medicine, and the population increased about 50 percent between 1900 and 1960. France continued to dominate the economy. Food crop cultivation was neglected as French sociétés (companies) established cash crop plantations in the coastal regions. The result was an economy dependent on the exporting of vanilla, ylang-ylang, cloves, cocoa, copra, and other tropical crops. Most profits obtained from exports were diverted to France rather than invested in the infrastructure of the islands. Development was further limited by the colonial government's practice of concentrating public services on Madagascar. One consequence of this policy was the migration of large numbers of Comorans to Madagascar, where their presence would be a long-term source of tension between Comoros and its giant island neighbor. The Shirazi elite continued to play a prominent role as large landowners and civil servants. On the eve of independence, Comoros remained poor and undeveloped, having only one secondary school and practically nothing in the way of national media. Isolated from important trade routes by the opening of the Suez Canal in 1869, having few natural resources, and largely neglected by France, the islands were poorly equipped for independence.

In 1946 the Comoro Islands became an overseas department of France with representation in the French National Assembly. The following year, the islands' administrative ties to Madagascar were severed; Comoros established its own customs regime in 1952. A Governing Council was elected in August 1957 on the four islands in conformity with the loi-cadre (enabling law) of June 23, 1956. A constitution providing for internal self-government was promulgated in 1961, following a 1958 referendum in which Comorans voted overwhelmingly to remain a part of France. This government consisted of a territorial assembly having, in 1975, thirty-nine members, and a Governing Council of six to nine ministers responsible to it.

Data as of August 1994