Increasing acts of terrorism round the world were bound to make travel tougher. Now the U.S. has clamped down on unwelcome visitors by requiring visas of anyone who visits the country, even in transit; Canadians alone are exempted. On its face, the decision seems inhospitable. Up to now, anyone who felt like it could spend ten days in the U.S. without having to get a visa.
The American Government has reasons for changing its policy. According to U.S. officials, in the last year some 5,000 persons have entered the U.S. supposedly in transit, only to disappear. When they reappear, many have a...
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