Trans-Saharan trade

Trans-Saharan trade requires travel across the Sahara between sub-Saharan Africa and North Africa. While existing from prehistoric times, the peak of trade extended from the 8th century until the early 17th century.
The Sahara once had a very different environment. In Libya and Algeria, from at least 7000 BC, there was pastoralism, the herding of sheep, goats, large settlements, and pottery. Cattle were introduced to the Central Sahara (Ahaggar) from 4000 to 3500 BC. Remarkable rock paintings (dated 3500 to 2500 BC) in places that are currently very dry, portray flora and fauna that are not present in the modern desert environment.

As a desert, Sahara is now a hostile expanse that separates the Mediterranean economy from the economy of the Niger basin. As Fernand Braudel points out, crossing such a zone, especially without mechanized transport, is worthwhile only when exceptional circumstances cause the expected gain to outweigh the cost and the danger. Trade was conducted by caravans of camels. According to Ibn Battuta, the explorer who accompanied one of the caravans, the average size per caravan was 1,000 camels, but some caravans were as large as 12,000. The caravans would be guided by highly-paid Berbers, who knew the desert and could ensure safe passage from their fellow desert nomads. The survival of a caravan was precarious and would rely on careful co-ordination. Runners would be sent ahead to oases crossed the desert from Sijilmasa via the salt mines at Taghaza to the oasis of Oualata. A guide was sent ahead and water was brought on a journey of four days from Oualata to meet the caravan.

Culture and religion were also exchanged on the Trans-Saharan Trade Route. Many West African states eventually adopted Arabic writing and the religion of North Africa, resulting in them being absorbed into the Muslim world.

Early trans-Saharan trade

Ancient trade spanned the northeastern corner of the Sahara in the Naqadan era. Predynastic Egyptians in the Naqada I period traded with Nubia to the south, the oases of the Western Desert to the west, and the cultures of the eastern Mediterranean to the east. Many trading routes went from oasis to oasis to resupply on both food and water. These oases were very important. They also imported obsidian from Senegal to shape blades and other objects.

The overland route through the Wadi Hammamat from the Nile to the Red Sea was known as early as predynastic times; drawings depicting Egyptian reed boats have been found along the path dating to 4000 BC. Ancient cities dating to the First Dynasty of Egypt arose along both its Nile and Red Sea junctions, testifying to the route's ancient popularity. It became a major route from Thebes to the Red Sea port of Elim, where travelers then moved on to either Asia, Arabia or the Horn of Africa. Records exist documenting knowledge of the route among Senusret I, Seti, Ramesses IV and also, later, the Roman Empire, especially for mining.

The Darb al-Arbaʿīn trade route, passing through Kharga in the south and Asyut in the north, was used from as early as the Old Kingdom for the transport and trade of gold, ivory, spices, wheat, animals and plants. Later, Ancient Romans would protect the route by lining it with varied forts and small outposts, some guarding large settlements complete with cultivation. Described by Herodotus as a road "traversed ... in forty days", it became by his time an important land route facilitating trade between Nubia and Egypt, and subsequently became known as the Forty Days Road. From Kobbei, north of al-Fashir, the route passed through the desert to Bir Natrum, another oasis and salt mine, to Wadi Howar before proceeding to Egypt. The Darb el-Arbain trade route was the easternmost of the central routes.

The westernmost of the three central routes was the Ghadames Road, which ran from the Niger River at Gao north to Ghat and Ghadames before terminating at Tripoli.

Next was the easiest of the three routes: the Garamantean Road, named after the former rulers of the land it passed through and also called the Bilma Trail. The Garamantean Road passed south of the desert near Murzuk before turning north to pass between the Alhaggar and Tibesti Mountains before reaching the oasis at Kawar. From Kawar, caravans would pass over the great sand dunes of Bilma, where rock salt was mined in great quantities for trade, before reaching the savanna north of Lake Chad. This was the shortest of the routes, and the primary exchanges were slaves and ivory from the south for salt. One early 20th century researcher wrote of the Tripoli-Murzuk-Lake Chad route, “Most of the rans-Saharantraffic from the Mediterranean coast during the last 2,000 years has passed along this road.”

Another Libyan route was Benghazi to Kufra to the lands of the Wadai Empire between Lake Chad and Darfur.

The western routes were the Walata Road, from the Sénégal River, and the Taghaza Trail, from the Niger River, which had their northern termini at the great trading center of Sijilmasa, situated in Morocco just north of the desert. The growth of the city of Aoudaghost, founded in the 5th century BCE, was stimulated by its position at the southern end of a trans Saharan trade route.

To the east, three ancient routes connected the south to the Mediterranean. The herdsmen of the Fezzan of Libya, known as the Garamantes, controlled these routes as early as 1500 BC. From their capital of Germa in the Wadi Ajal, the Garamantean Empire raided north to the sea and south into the Sahel. By the 4th century BC, the independent city-states of Phoenicia had expanded their control to the territory and routes once held by the Garamantes. Shillington states that existing contact with the Mediterranean received added incentive with the growth of the port city of Carthage. Founded c. 800 BCE, Carthage became one terminus for West African gold, ivory, and slaves. West Africa received salt, cloth, beads, and metal goods. Shillington proceeds to identify this trade route as the source for West African iron smelting. Trade continued into Roman times. Although there are Classical references to direct travel from the Mediterranean to West Africa (Daniels, p. 22f), most of this trade was conducted through middlemen, inhabiting the area and aware of passages through the drying lands. The Legio III Augusta subsequently secured these routes on behalf of Rome by the 1st century AD, safeguarding the southern border of the empire for two and half centuries.

The Garamantes also engaged in the trans-Saharan slave trade. The Garamantes used slaves in their own communities to construct and maintain underground irrigation systems known as the '' foggara''. Early records of trans-Saharan slave trade come from ancient Greek historian Herodotus in the 5th century BC, who records the Garementes enslaving cave-dwelling Egyptians in Sudan. Two records of Romans accompanying the Garamentes on slave raiding expeditions are recorded - the first in 86 CE and the second a few years later to Lake Chad. Initial sources of slaves were the Toubou people, but by the 1st century CE, the Garmentes were obtaining slaves from modern day Niger.

In the early Roman Empire, the city of Lepcis established a slave market to buy and sell slaves from the African interior. The empire imposed customs tax on the trade of slaves.
In 5th century AD, Roman Carthage was trading in black slaves brought across the Sahara. Black slaves seem to have been valued in the Mediterranean as household slaves for their exotic appearance. Some historians argue that the scale of slave trade in this period may have been higher than medieval times due to high demand of slaves in the Roman Empire.

Introduction of the camel

Herodotus had spoken of the Garamantes hunting the Ethiopian Troglodytes with their chariots; this account was associated with depictions of horses drawing chariots in contemporary cave art in southern Morocco and the Fezzan, giving origin to a theory that the Garamantes, or some other Saran people, had created chariot routes to provide Rome and Carthage with gold and ivory. However, it has been argued that no horse skeletons have been found dating from this early period in the region, and chariots would have been unlikely vehicles for trading purposes due to their small capacity.

The earliest evidence for domesticated camels in the region dates from the 3rd century. Used by the Berber people, they enabled more regular contact across the entire width of the Sahara, but regular trade routes did not develop until the beginnings of the Islamic conversion of West Africa in the 7th and 8th centuries. Two main trade routes developed. The first ran through the western desert from modern Morocco to the Niger Bend, the second from modern Tunisia to the Lake Chad area. These stretches were relatively short and had the essential network of occasional oases that established the routing as inexorably as pins in a map. Further east of the Fezzan with its trade route through the valley of Kaouar to Lake Chad, Libya was impassable due to its lack of oases and fierce sandstorms. A route from the Niger Bend to Egypt was abandoned in the 10th century due to its dangers.

Spread of Islam

Several trade routes became established, perhaps the most important terminating in Sijilmasa (Morocco) and Ifriqiya to the north. There, and in other North African cities, Berber traders had increased contact with Islam, encouraging conversions, and by the 8th century, Muslims were traveling to Ghana. Many in Ghana converted to Islam, and it is likely that the Empire's trade was privileged as a result. Around 1050, Ghana lost Aoudaghost to the Almoravids, but new goldmines around Bure reduced trade through the city, instead benefiting the Malinke of the south, who later founded the Mali Empire.

Unlike Ghana, Mali was a Muslim kingdom since its foundation, and under it, the gold–salt trade continued. Other, less important trade goods were slaves, kola nuts from the south and slave beads and cowry shells from the north (for use as currency). It was under Mali that the great cities of the Niger