There has been a pronounced decline in the number of wars and the deadliness of war in the world. One expert, John Mueller, professor of political science at Ohio State University, writes: “We may be reaching a point where war – in both its international and civil varieties – ceases, or nearly ceases to exist, a remarkable development that has attracted little notice.”
Harvard professor of psychology Steven Pinker says that it “may be the most important thing that has ever happened in human history”. He writes in The Better Angels of Our Nature: “We may be living in the most peaceable era in our species’ existence.”
So what is the evidence so far? Let’s start with recent history, where the data is clearest….