As Martin Davidoff trekked through the blazing heat of Mexico's Sonora Desert in the spring, he carried the migration papers of his grandfather, who came to the United States a century ago to escape religious persecution in his native Russia. Although Davidoff, a college mathematics teacher, has never known what it's like to flee a country in search of a better life, he kept the papers in his pocket as a reminder of the personal connection he had to the Migrant Trail Walk that he had decided to undergo. "It was a very moving experience for me," Davidoff said. The walk, organized each year by several human-rights organizations, is a seven-day, 75-mile trek from Sasabe, Mexico, to Tucson, Ariz. The route is commonly used by Mexican migrants attempting to enter the United States, according to the Coalición de Derechos Humanos...
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