There are a lot of issues that are debatable about the First World War. There is one fact, though, that ought to be beyond debate, and which ought to be acknowledged on all sides in the national conversation during this centenary year.
Reasonable people can differ, for example, on how important imperial rivalry was in causing the war. What all reasonable people should agree on, however, is that if, by some miracle, the major European powers had managed to stabilise their relationships…