Good question.
It has been explained a wall is not necessary everywhere along the ~ 1700 ~ mile border from CA to TX. There are areas in AZ, NM & TX that are long distances from towns in Mexico, very arid, isolated or difficult to pass (along Rio Grande in Big Bend area with sheer cliffs, etc.). There won't be significant # people attempting to cross these areas - those that do take extreme risk to do so. Some of these areas can be surveilled / patrolled by electronic means / drones if need be.
A wall is needed in areas along the border where there are US cities / towns, population centers. A long continuous wall where large numbers of people attempt to cross the border. It might go 100's of miles along the border in these areas to detour illegal crossings. This will significantly reduce daily mass and or frequent crossings. Yes, there may be some people that manage to scale a wall or dig under but many of these would be caught due to electronic means or border security patrols or both.
Yes, some could attempt to go around the wall, but it will require them to travel great distances in very arid / remote regions to do so. If they do go around the end of the wall they will still be in arid / remote regions of the US - far from US population centers. End of wall areas can be monitored by electronic means or drones.
Point is the wall or walls will not stop ALL crossings but it will significantly reduce mass numbers of illegal crossings. It will also act as a future deterrent to people thinking about / attempting to illegally cross our border from the south.
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Last edited: Jan 11, 2019