And they will.
The only effective way to prevent illegal immigration is to remove the incentive for it. If there is no benefit to coming to the USA, they will not come. That's where our focus should be.
Remove the incentive.
How? Explicamelo, por favor.
Fact is, the fence does work now. That is why they go around it.
Strange you claim a fence will not stop 100%, therefore it's impractical, BUT the Incentive Removal plan is 100% foolproof.