But the penetration into Africa wasn’t just about Bibles and maps. Economically, sub-Saharan Africa was attractive to Europe’s ruling class. Africa represented an open market to Britain, Germany, France and other European countries. The demand for raw materials such as copper, rubber, cocoa, tea, gold and diamonds had increased in Europe. These natural resources could be found in Africa and made the continent a valuable resource. Because of this, there was political pressure, particularly in Great Britain, which already had an empire, to expand colonial territories and secure lucrative markets. Germany, under its leader Chancellor Otto von Bismark, wanted its chance to control overseas territories, and called for the Berlin Conference (1884-1885). European representatives from fourteen different countries attended this conference where, in order to avoid conflict with one another, they set out rules on the control of foreign territories. No representatives from Africa were invited.