There has been a dramatic increase in the number of African migrants attempting to travel into the U.S. through Mexico.
In 2007, the Mexican government started keeping records on migrants from countries in Africa. At that time, The Los Angeles Times reported, an annual immigration report included 460 migrants from Africa. In 2018, that number was roughly 2,700 and in 2019 it doubled to about 5,800. From the Times:

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