The U.S.-Mexico border runs nearly 2,000 miles, much of it across the Sonora Desert, between a very rich country and a moderately poor one. It can never be completely secured against migration no matter how much it's militarized.
I assume you understand by now that you woke up this morning on an overheated planet of slums threatened by ecological collapse. So instead, let's get right to the point: what do we do about it? How do we begin to heal the wounds?
Obama's Op-Ed on immigration today is designed to please both sides of the debate, which is why it's either uninformed or cynical. Informed analysts know trying to "secure the borders" first is all backwards.