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For the foreseeable future, there is not likely to be any decline in the happy hordes of foreign visitors flocking to the bargain-filled U.S. They are destined to become a familiar part of the American landscape: buying, bargaining, hitchhiking, backpacking, snapping pictures, sampling strange food and occasionally getting ripped off by predators who know they carry a lot of dollars, however devalued. The ailing greenback has at least made America less of a mystery to the rest of the world.