Between Us: Thousands of people from Central America travel more than 4,000km to the US-Mexico border every year. For many, their goal is to seek asylum in the United States. Their arrival in migrant caravans sparks a fierce debate on immigration in the US. There is strength in numbers but somewhere along the way to the US-Mexico border hope fades. For Correspondent John Holman this story has been the most difficult to get right.
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