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Every year since the 1950s, more people have arrived in America than have left. But that may change this year, as the Trump administration pursues its zero-migration policy with breathtaking vigour. Closing the borders could end up being the most significant of all Donald Trump’s economic moves. It is likely to make the country smaller, poorer and less innovative.
Looking beyond its borders, America has long worried about the Russians getting ahead—in anything. “We must not allow a mine-shaft gap!” bellowed a general in the 1964 film “Dr. Strangelove”. Today it is the icebreaker gap that worries American planners. Russia has many; America has three (that work). Influence in the Arctic beckons—but only Finland can make the ships America needs to win it. | 
