Decades ago, when I began teaching international history, I used to ask students if they thought it was possible for nations to end their fighting of wars against one another. Their responses varied. But the more pessimistic conclusions were sometimes tempered by the contention that, if the world’s nations faced a common foe, such as an invasion from another planet, this would finally pull them together.
I was reminded of this on March 23, when the UN Secretary-General, António