Answer:
Unspecified time.
But it could still be claimed to have occurred at a time when the topic of African American slavery is widely known in Africa.
Explanation:
The book of a play titled "Dilemma of a Ghost" was written by Ama Ata Aidoo. Though the play was set in Ghana, the time of the beginning of the book which is Act one is unspecified.
However, judging from the conversation, it could still be claimed that "Act one" occurred at a time when the topic of African American slavery is widely known in Africa.
This is evident when Nana, the grandmother of Ato questioned that "And so, my grand-child, all you want to tell us is that your wife is a slave?" This is a reference to Ato's wife who happens to be an African American.
