The islands of São Tomé and Príncipe were uninhabited at the time of the arrival of the Portuguese sometime between 1469 and 1471. After the islands were discovered by the explorers João de Santarém and Pêro Escobar, Portuguese navigators explored the islands and decided they would be a good location for bases to trade with the mainland. History of Portuguese São Tomé and Príncipe The first successful settlement of São Tomé was established in 1493 by Álvaro Caminha, who received the land as a grant from the crown. Príncipe was settled in 1500 under a similar arrangement. Attracting settlers proved difficult, however, and most of the earliest inhabitants were "undesirables" sent from Portugal, mostly Jews. In time, these settlers found the excellent volcanic soil of the region suitable for agriculture, especially the growing of sugar. The cultivation of sugar was a labor-intensive process, and the Portuguese began to import large numbers of slaves from the African mainland. By the mid-16th century, the Portuguese settlers had turned the islands into Africa's foremost exporter of sugar. São Tomé and Príncipe were taken over and administered by the Portuguese crown in 1522 and 1573, respectively. However, superior sugar colonies in the western hemisphere had begun to hurt the islands. The large slave population also proved difficult to control with Portugal unable to invest many resources in the effort. As well, the Dutch captured and occupied São Tomé for seven years in 1641, razing over 70 sugar mills. Sugar cultivation thus declined over the next 100 years, and by the mid-17th century, the economy of São Tomé had changed. It was now primarily a transit point for ships engaged in the slave trade between the West and continental Africa. In the early 19th century, two new cash crops, coffee and cocoa, were introduced. The rich volcanic soils proved well suited to the new cash crop industry, and soon extensive plantations (roças), owned by Portuguese companies or absentee landlords, occupied almost all of the good farmland. By 1908, São Tomé had become the world's largest producer of cocoa, which still is the country's most important crop. The roças system, which gave the plantation managers a high degree of authority, led to abuses against the African farm workers. Although Portugal officially abolished slavery in 1876, the practice of forced paid labor continued. In the early 20th century, an internationally publicized controversy arose over charges that Angolan