Human history
During the 15th century the Portuguese began exploring Africa. At the Guinea coast they built their first fort in 1482. They started slave trade after the first European contact with America in 1492 to supply settlers from there with workers. Soon English, Spanish, Dutch, French and Danish merchants also built forts. But their influence on the inland was minor (except from decimation of population by slave trade) till during the 19th century larger colonies were founded.