It doesn’t mean we have to shut down trade but controlling the border does mean a virtual lockdown. In fact, doing so would probably cause Mexico to shut down trade which is fine with me if they want to starve themselves into fixing their own problems.
Fact is, sealing the pressure valve will force Mexico to deal with its problems one way or the other.
I don’t think Mexico can deal with the problem. Of course that doesn’t mean America needs to do it for them.
It is in our interest to have a strong & friendly neighbor which we don’t have in Mexico. Sealing the pressure valve will likely result in a higher level of violence initially. Perhaps out and out war.