For its twenty-fifth anniversary, Britain's Baillie Gifford Prize for nonfiction has launched a contest to determine the "best of the best" with a shortlist from among its twenty-five winners. The six shortlisted authors include one British writer, three Americans -- and two Canadians, Margaret Macmillan for 1919 and Wade Davis for Into the Silence.
On a related topic, I've updated March first's post about historians writing fiction to add a new comment.