When Portuguese explorers reached Mozambique in 1498, Arab-trading settlements had existed along the coast and outlying islands for several centuries. From about 1500, Portuguese trading posts and forts became regular ports of call on the new route to the east. Later, traders and prospectors penetrated the interior regions seeking gold and slaves. Although Portuguese influence gradually expanded, its power was limited and exercised through individual settlers who were granted extensive autonomy. As a result, investment lagged while Lisbon devoted itself to the more lucrative trade with India and the Far East and to the colonization of Brazil.

By the early 20th century the Portuguese had shifted the administration of much of the country to large private companies, controlled and financed mostly by the British, which established railroad lines to neighboring countries and supplied cheap--often forced--African labor to the mines and plantations of the nearby British colonies and South Africa. Because policies were designed to benefit white settlers and the Portuguese homeland, little attention was paid to Mozambique's national integration, its economic infrastructure, or the skills of its population.

After World War II, while many European nations were granting independence to their colonies, Portugal clung to the concept that Mozambique and other Portuguese possessions were overseas provinces of the mother country, and emigration to the colonies soared. Mozambique's Portuguese population at the time of independence was about 250,000. The drive for Mozambican independence developed apace, and in 1962 several anti-colonial political groups formed the Front for the Liberation of Mozambique (FRELIMO), which initiated an armed campaign against Portuguese colonial rule in September 1964. After 10 years of sporadic warfare and major political changes in Portugal, Mozambique became independent on June 25, 1975.

The last 30 years of Mozambique's history have reflected political developments elsewhere in the 20th century. Following the April 1974 coup in Lisbon, Portuguese colonialism collapsed. In Mozambique, the military decision to withdraw occurred within the context of a decade of armed anti-colonial struggle, initially led by American-educated Eduardo Mondlane, who was assassinated in 1969. When independence was achieved in 1975, the leaders of FRELIMO's military campaign rapidly established a one-party state allied to the Soviet bloc and outlawed rival political activity. FRELIMO eliminated political pluralism, religious educational institutions, and the role of traditional authorities.

The new government gave shelter and support to South African (ANC) and Zimbabwean (ZANU) liberation movements while the governments of first Rhodesia and later apartheid South Africa fostered and financed an armed rebel movement in central Mozambique called the Mozambican National Resistance (RENAMO). Civil war, sabotage from neighboring states, and economic collapse characterized the first decade of Mozambican independence. Also marking this period were the mass exodus of Portuguese nationals, weak infrastructure, nationalization, and economic mismanagement. During most of the civil war, the government was unable to exercise effective control outside of urban areas, many of which were cut off from the capital. An estimated 1 million Mozambicans perished during the civil war, 1.7 million took refuge in neighboring states, and several million more were internally displaced. In the third FRELIMO party congress in 1983, President Samora Machel conceded the failure of socialism and the need for major political and economic reforms. He died, along with several advisers, in a suspicious 1986 plane crash.

His successor, Joaquim Chissano, continued the reforms and began peace talks with RENAMO. The new constitution enacted in 1990 provided for a multi-party political system, market-based economy, and free elections. The civil war ended in October 1992 with the Rome General Peace Accords. Under supervision of the ONUMOZ peacekeeping force of the United Nations, peace returned to Mozambique.

By mid-1995 the more than 1.7 million Mozambican refugees who had sought asylum in neighboring Malawi, Zimbabwe, Swaziland, Zambia, Tanzania, and South Africa as a result of war and drought had returned, as part of the largest repatriation witnessed in Sub-Saharan Africa. Additionally, a further estimated 4 million internally displaced people returned to their areas of origin.