Which of the following was not a factor leading to the decolonization of Africa?

A. A lack of history in self government
B. A rise in African nationalism
C. International pressures exerted both on the imperial powers and Africa
D. A changing of attitude about imperialism in Europe

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.