Instead of the incentive to get here, such as get over the wall and reap all the benefits, take away the incentive. Make it so they wouldn’t come over illegally if you sent a limousine for them. Make it so there are severe penalties just for being here illegally, and no benefits. You wouldn’t even need a wall.
I have been saying that ever sense they shut down Operation Wetback.
If Mexicans put half the energy into fixing their country as they do in destroying ours they might someday have a country worth living in.