The wall has always been a boondoggle. It won't stop a single person from overstaying a visa. And those walking in are motivated enough that a wall won't stop them, or slow them down significantly. And it's not just my opinion. Here's a story that quotes two Professors who study immigration and population. Dr Nadia Flores, a researcher at Texas Tech University and herself a former undocumented immigrant, has been tracking the movements of people from Mexico and El Salvador to the US. She has studied the systems by which immigrant communities, together with employers and landlords, help undocumented individuals thrive in the US and drive the continued flow of people. "You have the demand for labour, and as long as you have the demand for labour and employers recruiting workers through these social networks, they are going to continue bringing people,” she said. “No matter whether you have a wall, these workers are going to find a way to cross and get to the US because they have this magnet attracting them." Right size the supply for immigrant labor with demand and we'll have much better control of the flow of migrants coming and going over the border. And a wall becomes even more of a boondoggle.