When Barack Obama invited his Mex-ican counterpart, Felipe Calderon, to be his guest in Washington for only the second state visit of his presidency, he was underlining that the two neighbours have become friends. Yet the timing of the trip, on May 19th, has turned out to be unfortunate. It comes amid a furious row on both sides of the border over a law approved in Arizona last month, which requires state police to check the immigration status of any "suspicious" individuals, apparently meaning Mexicans.
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