Would-be immigrants on a fence separating Morocco from the north African Spanish enclave of Melilla. Photograph: Blasco Avellaneda Few issues excite politicians’ and voters’ passions as much as immigration. For decades now, the world has been on the move: last year, according to the United Nations Population Fund, the number of people living outside their country of origin reached 232 million – 50% more than in 1990. That may feel like a lot of people; in fact, it represents just 3.2% of the world’s population. They are, however, unevenly spread: 60% live in the developed world, including 72 million in Europe, 71 million in Asia and 53 million in North America. Nearly two-thirds of migrants...
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