Over the past three months, the number of Central Americans arriving at the U.S.-Mexico border has jumped exponentially, and total border crossings have reached levels last seen in 2006.

Yet, while the number of families arriving between official border crossings has skyrocketed, the number of migrants seeking asylum at official border crossings has remained relatively constant, at around 4,200 per month.

It's not that these families prefer to cross the Rio Grande or scale the border wall. Instead, our research shows that at least part of this pattern can be explained by a U.S. policy that has left thousands of individuals waiting to request asylum in Mexican border cities since the summer of 2018.

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