African literature post-colonialism colonialism cultural conflict Igbo culture Nigerian history traditional society modernity identity masculinity tragedy classic literature 20th-century literature historical fiction cultural heritage societal change literary criticism Chinua Achebe Harold Bloom Bildungsroman allegory symbolism anthropology ethnography cross-cultural indigenous peoples European imperialism resistance folklore myth oral tradition character study societal norms generational conflict existentialism rural life family dynamics power dynamics moral dilemmas psychological depth narrative structure thematic analysis critical essays educational resource literary analysis.