The huge corollary to the USA migrant problem has always been Mexico. Now, of course, they are no longer passing through so easily and must face the prospect of staying anyway. Thus Mexico now has its own problem without the absorption ability.
I do suspect that this whole movement was contrived by activists to the extent of providing travel cash in particular. Making the border impassable will discourage further adventurism. We can see that the window is closing.
Mexico tried to skate, but are now caught. These folks mu8st be forced back.
Mexico Has Its Own Migrant Crisis — and the President Isn't Happy
By Deborah Bonello