You do know there are literally HUGE FUCKING LAKES dividing our border and that more than 50% of it is a river that neither country owns right?

Aside from that more than 90% of undocumented immigrants FLY into the US, less than 1% tunnel in (under the existing walls), roughly 5% drive right past the border checkpoints, around 2% walk around the fence at one of the two OCEANS, and the wall would prevent exactly 0% of immigration while diverting funds from schools, libraries, public-works, parks, healthcare, and hundreds of other things you take for granted ...