Walking west on 46th Street in Manhattan, just three blocks from Rockefeller Center, one passes Brazilian restaurants, the office of New York's Brazilian newspaper, a Brazilian travel agency, a business that sends remittances and wires flowers to Brazil, and a store that sells Brazilian food products, magazines, newspapers, videos, and tapes. These businesses are the tip of an ethnic iceberg, an unseen minority estimated to number some 80,000 to 100,000...