History 30 Economic conditions 15 Politics and government 13 Social conditions 8 History and criticism 7 In literature 6 Economic policy 5 Civilization 4 Mass media and culture 4 Political culture 4 Women 4 Corruption 3 Criticism and interpretation 3 Foreign relations 3 Literature and society 3 Mass media and technology 3 Postcolonialism 3 Religious aspects 3 Social aspects 3 Yoruba (African people) 3 Art, Nigerian 2 Case studies 2 Church and state 2 City planning 2 Colonies 2 Decolonization 2 Description and travel 2 Ethnic conflict 2 Feminism 2 Fiction 2