Canadian literature is often divided into French- and English-language literatures, which are rooted in the literary traditions of France and Britain, respectively. There are four major themes that can be found within historical Canadian literature; nature, frontier life, Canada's position within the world, all three of which tie into the garrison mentality. By the 1990s, Canadian literature was viewed as some of the world's best. Canada's ethnic and cultural diversity are reflected in its literature, with many of its most prominent modern writers focusing on ethnic life. Arguably, the best-known living Canadian writer internationally (especially since the deaths of Robertson Davies and Mordecai Richler) is Margaret Atwood, a prolific novelist, poet, and literary critic. Numerous other Canadian authors have accumulated international literary awards, including Nobel laureate Alice Munro, who has been called the best living writer of short stories in English; and Booker Prize recipient Michael Ondaatje, who is perhaps best known for the novel ''The English Patient'', which was adapted as a film of the same name that won the Academy Award for Best Picture.