[The Conversation Africa] South Africa has 12 official languages. The two most dominant are isiZulu and isiXhosa. While the Zulu and Xhosa people share a rich common history, they have also found themselves engaged in ethnic conflict and division, notably during urban wars between 1990 and 1994. A new book, Divided by the Word, examines this history - and how colonisers and African interpreters created the two distinct languages, entrenched by apartheid education. Historian Jochen S. Arndt answers some questions about his book.