"Colonialism in a nutshell" Towards Colonial Freedom by Kwame Nkrumah

Colonial existence under imperialist conditions necessitates a fierce and constant struggle for emancipation from the yoke of colonialism and exploitation.  The aim of all colonial governments in Africa and elsewhere has been the struggle for raw materials; and not only this, but the colonies have become the dumping ground and colonial peoples the false recipients, of manufactured goods of the industrialists and capitalists of Britain, France Belgium and other colonial powers who turn to the dependent territories which feed their industrial plants. This is Colonialism in a nutshell. 

The basis of colonial territorial dependence is economic but the basis of the solution of the problem is political. Hence political independence is an indispensable step towards securing economic emancipation.