The barbed wire is part of President Donald Trump's order to send more than 7,000 active duty troops to parts of Texas, Arizona, and California.
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The forces sent out to the border include military police, as well as an assault helicopter battalion.
Right now, the caravan has about 4,000 migrants heading towards Mexico City.
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According to officials, once in Mexico City, some families will decide to stay. Meanwhile, others will continue their journey to the border.
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