The vast majority of ANYONE who "caravans" like this to the USA will ultimately get in. And they know it, the Dems have made it crystal clear.
There is no real concerted means or effort to stop them. As many in the US will fight for their entry as will fight against.
The military will be a paper tiger. Probably unarmed and not even allowed to interact. Totally symbolic.
We are a divided nation....the Right wants borders....the Left does not.
The two sides will fight over it and use the courts to move the goal posts repeatedly, while the immigrants make their way in.
Force will not be used, because it is political suicide.
I do believe the caravans will be symbolically held temporarily in some way, while the Left media creates a firestorm of propaganda video and stories of the horrible treatment and human injustices....while the Left gathers it's Leftist judges and files motions upon motions granting entry.
As I have maintained, ONLY THE TRUE PATRIOTS OF AMERICA, as mentioned in the Constitution, (as few as there are remaining) can actually stop the flow of illegal immigrants.
And unfortunately, these people are not about to stop if they've come this far, for anything short of violence.
And the government will then step in to arrest those patriots that tried to defend their nation.
How else could this play out?