BROWNSVILLE, Tex. - In full view of the bridge that spans the Rio Grande between here and Matamoros, Mexico, dozens of Mexican boys each day strip off every stitch of clothing, wade in up to their necks, and cross into the United States illegally.

Above the din of the bridge traffic, you can hear the boys chattering - unworried - as they make their way across the dirty stream that separates the two countries. On the other side, they dress and disappear into the crowded streets of downtown Brownsville.

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