<P> In the US, Madison Grant, head of the New York Zoological Society, exposed Pygmy Ota Benga in the Bronx Zoo alongside the apes and others in 1906 . At the behest of Grant, a prominent scientific racist and eugenicist, zoo director Hornaday placed Ota Benga in a cage with an orangutan and labeled him "The Missing Link" in an attempt to illustrate Darwinism, and in particular that Africans like Ota Benga are closer to apes than were Europeans . Other colonial exhibitions included the 1924 British Empire Exhibition and the successful 1931 Paris "Exposition coloniale". </P> <P> From the beginning of the 20th century onward, the elimination or control of disease in tropical countries became a driving force for all colonial powers . The sleeping sickness epidemic in Africa was arrested due to mobile teams systematically screening millions of people at risk . In the 20th century, Africa saw the biggest increase in its population due to lessening of the mortality rate in many countries due to peace, famine relief, medicine, and above all, the end or decline of the slave trade . Africa's population has grown from 120 million in 1900 to over 1 billion today . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2011) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2011) (Learn how and when to remove this template message) </Td> </Tr>

How did the scramble for africa in the 1800s and 1900s affect the current borders of africa