Because they have cell phones.tequila4kapp said:
What a wacky coincidence that migrants from far away lands throughout the Americas somehow know that all they have to do is say the word "asylum" and they get to enter the country. Hmmm. Wonder how that happens?
In my graduate program (https://polisci.ucsd.edu/people/faculty/faculty-directory/emeriti-faculty/cornelius-profile.html)
Wayne's research showed just how powerful these information networks were and how migrants communicated in near real time to conditions in regional labor markets. He was trying to understand why and how migrant communities from the same mexican villages ended up in same neighborhoods 1000s of miles away.
That was actually in the ear before the ubiquitous nature of smart phones and relied upon a lot of more mudane forms of communication.
I lost touch with Wayne's research after I left but it was smart on.
But it isn't at ALL surprising that this is communicate back town the asylum chain.