Byzantines and Saracens dominated the Mediterranean until the 11th century. The fight against the Saracen threat, which extensively practiced piracy, by Pisa and Genoa, ended their domination. Later, the Italians themselves practiced piracy, especially on the coasts of Asia Minor. Privateering companies were often formed to finance such ventures, and often it was not even possible to distinguish between trade missions and piracy. For the inhabitants of Andalusia, too, the capture of Moorish ships and the landing on African coasts, where they robbed and turned captives into slaves, constituted a lucrative business. Due to the repression of Arab-Syrian traders in the course of the Crusades, the Italian city-states were now also able to trade directly with the Levant and the Orient. Especially the European population growth since about 1000 (peak around 1300) boosted this long-distance trade.
The crisis of the 14th century with the plague and urban exodus also affected the nobility. As a result of the gradual decline of feudal structures, the nobility had concentrated on luxury goods as a sign of a lifestyle befitting their status. Due to the anarchic conditions during the Reconquista, the nobles, especially in Castile, were able to secure large land grants from the Spanish king. The regular incursions into the (still) remaining Moorish lands of the Iberian Peninsula had also become important sources of income for the latter. The nobility also became increasingly involved in economic ventures such as the tuna trade (which was as important for food and trade as the salt herrings in northern Europe) and built up their own fleets for this purpose. The European discovery of Guinea's Gold Coast therefore also involved ships of the nobility from the beginning. And also the settlement of islands in the Atlantic was started by great vassals of the Spanish king; only later the crown itself followed.
Access to the luxury goods of the Orient (carpets, spices, dyes, etc.), which were coveted throughout Europe, could only be obtained through Arab middlemen. Thus Egypt controlled the trade in Arab and Indian goods. Although European traders were welcome, onward travel for foreigners beyond Cairo was forbidden. The so-called "Latin" trade route that bypassed this "Muslim blockade" had been blocked since the end of the 14th century: After the collapse of the vast Mongol Empire founded by Genghis Khan, especially through Timur Lenk's conquests and the national revolution of the Ming dynasty in China, the "Mongol route" was closed to Italian merchant caravans. The advance of the Ottomans in the 15th century further complicated the Italians' trade with Asia. The Orient was thus closed to Europe.
The initial situation of European overseas expansion, which heralded the age of colonialism, was thus partly determined by the endeavour to open up alternative trade routes to the long-distance trade networks (trade with India) controlled by the Ottoman rulers and asserted against the grasp of the Europeans. Bartolomeu Dias opened the way to the Indian Ocean by sailing around the Cape ofGood Hope in 1488, which enabled Vasco da Gama to reach India by ship in 1498. From their Indian base at Goa, the Portuguese managed to reach Malacca in 1509 and conquer it under Afonso de Albuquerque in 1511. The Atlantic crossing by Columbus in 1492 led to the beginning of the European exploration, conquest and settlement of the Americas.
Raising capital for the costly voyages of discovery had become easier due to advances in the monetary and credit systems. The emergence of the first banks in northern Italian city-states simplified the pooling of larger amounts of money for the expensive overseas ventures. Since the prospects of profit were very vague, the state often assumed the cost of sea expeditions to mitigate the high risk. Private companies usually participated only in chartering the ships with food and barter goods and received a fixed portion of the profits from the voyages in return. However, the overseas voyages of discovery were made possible not least by the development of the new type of ship, the caravel, which was distinguished among other things by its improved manoeuvrability under changing wind conditions.
The opening up of the West African coast by the Portuguese was followed by imports of slaves and gold to Europe. The ruling dynasty, which had a one-fifth share in the economic proceeds of this kind, remained interested in further expansion for its part. What this was all about is shown by designations such as "Ivory Coast", "Gold Coast" or "Slave Coast".
Gold and silver
The African gold trade was controlled by Muslim traders who brought the gold by caravan to the coasts of North Africa and thus also served European demand. In 1456, the Portuguese established the first trade link to the African gold zones. From 1475 onwards, gold was then brought to Portugal in large quantities by ship via Guinea in barter trade with sub-Saharan Africa, without any detour via Muslim traders. Nevertheless, due to the expensive purchase of oriental luxury articles and costly European wars, there continued to be a net outflow of gold from Europe for the time being.
Columbus also sought to highlight the wealth of gold as a special feature during his voyage of discovery to Caribbean America. The areas conquered by the Spaniards became a supposed El Dorado in the gold rush that set in after Pizarro had extorted over 13,000 pounds of gold and 26,000 pounds of silver from the Inca ruler Atahualpa. The silver deposits in Bolivia and Mexico, which were discovered before 1550 and immediately shipped to Europe, caused prices throughout Europe to rise by 400 percent as late as the 16th century.
Slave Trade
Since the High Middle Ages, the notion that Christians should not be made slaves has prevailed, and as Christianization progressed, slaves became a scarce "commodity" in Europe. There was an increased shift to the slave trade with the Levant from the 13th century onwards. At first, Muslim traders supplied them mainly from the Crimea, and from the 15th century onwards especially from the Balkans, where the Ottomans abducted Christians as prisoners of war and sold them to European, above all Italian, traders. Catalan slave traders, on the other hand, carried off their victims mostly from Asia Minor. The conquest of Constantinople in 1453 by the Ottomans, however, led to a decline in slave shipments from the Levant and resulted in price increases in Italy. Europe then reoriented itself towards slaves from Black Africa, which brought Muslim trade caravans to the North African coast.
On the Caribbean islands, sugar cane cultivation became the linchpin of colonial rule. After the extermination of almost the entire indigenous population, large areas were available for this purpose; African slaves were now "imported" on a large scale as labour. Catch and transport were organised by Europeans, Africans and Arabs in cooperation. The mortality rate during the ship passage under undignified conditions across the Atlantic alone was between 25 and 40 percent. The draconian punishments imposed on slaves in mines and on plantations meant that few of them lived beyond the age of 35. In the 17th and 18th centuries, the triangular trade flourished: European consumer products, often of inferior quality, were exchanged for slaves in Africa; these were shipped in chains across the Atlantic, mostly to the Caribbean, from where the ships then returned to Europe loaded with colonial goods such as sugar, rum, indigo, and more.
Colonial exploitation and cost-benefit relations
Like the Spanish and Portuguese, all later colonial powers sought to derive economic benefit from their colonial possessions - as they did in the partition of Africa. However, this was not preceded by a rational cost-benefit analysis. "Rather, after the acquisition of new territories, perplexity often set in as to what economic potential they possessed, how they should be administered, and what benefits they might bring to the mother country." Conquest was usually followed by three to four decades of predatory economics. Barter and overexploitation of resources dominated; investment in infrastructure was almost nonexistent.
The strongest economic link within the colonial empires proved to be the monetary association. France was particularly consistent in this respect and thus created a monetarily uniform colonial empire, which in Africa resulted in the francophone states maintaining close monetary relations with France even after their independence.
While the colonial powers' own cost-benefit balance with regard to their spheres of influence could be partly ambivalent and partly negative, the colonized were mainly exposed to plunder. Thus, during the decades of intensive economic relations with their mother countries, the colonies and semi-colonies of the European powers in Asia and Africa remained poor and backward, as did the semi-colonies of the USA in Latin America, while developments in Europe and North America showed a rapid increase in social prosperity. In 1914 nearly one-fourth of French capital investments abroad went to Russia, while barely 9 percent went to the French colonies. Germany's foreign investments before the outbreak of the First World War went to the colonial protectorates even to only 2 percent.
The comparatively late colonial power Japan was the only one to establish a planned industrial colonial economy in its sphere of influence, for example coal, iron and steel in Korea and Manchuria or cotton processing in Shanghai and northern China. The aim was to compensate for the lack of raw materials on the Japanese islands and to establish a large Asian economic area under Japanese control based on the division of labour. According to Osterhammel, this was the most repressive colonial regime in modern history; nevertheless, it left important foundations for further industrial development in Korea, Taiwan and parts of China.
States that were not colonial powers also benefited from colonialism. Switzerland, for example, never had any colonies of its own. Swiss explorers, missionaries and traders were, however, welcome by almost all colonial rulers thanks to Switzerland's status of neutrality and the good connections of the Swiss upper class. Scientists made stellar careers through colonial expeditions. They sent enormous quantities of found and stolen objects to Switzerland, which became the basis of the ethnological and natural science collections of several museums. Swiss families amassed fortunes through the slave trade. African children and youths without names worked in Switzerland as liftboys. The colonial commodity cocoa became a box office hit as Swiss chocolate.