africa
The desert, coastline, rivers, and plateaus of Africa create physical barriers that did not allow for the migration of people or animals into Africa. A disease barrier formed by parasites carrying deadly diseases killed most of the people and animals that did manage to get in Africa. Africa's wide-ranging and irregular climate made agriculture and travel difficult. The desert, coastline, rivers, and plateaus of Africa created physical barriers that did not allow for the migration of people or animals into Africa. The Sahara desert spans from the east coast to the west coast of the continent, isolating all of Africa to the south of it. The desert's size (it is larger than the entire continental U.S
If a foreign domesticated mammal was bitten by the tsetse fly, it would be infected with the sleeping sickness and die. If a person enters Africa without immunity to these diseases and a mosquito bites him/her, that person only has a 50 percent chance of living. This cut off access to the countryside. However, Africa also is home to the tsetse fly--an insect that only bites quadrupeds. Waterfalls also blocked access to interior portions of Africa. With unpredictable rainfall, it was difficult for people to know when to plant gardens. Mosquitoes restricted the movement of people into Africa, while the tsetse fly restricted the movement of animals into Africa. It is not uncommon for years of drought to follow many years of heavy rainfall. Since mosquitoes only bite bipeds, animals were safe from malaria. Africa's straight coastline has no natural harbors for people to dock ships in. Mosquitoes carry malaria, yellow fever, and dengue fever. ), and extreme dryness made it virtually impossible to cross. Africa's wide-ranging and irregular climate made agriculture and travel difficult. There were other parasites carrying diseases, and all of them blocked the migration of people and animals until 1880.
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