SInce the first edition of The World in Conflict, Donald Trump has entered the White House with Russian assistance, North Korea has tested a new generation of nuclear weapons and threatened all-out war on its enemies and Europe has been the repeated target of a new style of Islamic terror attack. Meanwhile, older conflicts still simmer in Africa, the Himalayas and elsewhere. These might be below the threshold of the daily headlines but the threat that they will explode into world-historical significance remains ever-present.