The US-Mexico border is around 1,900 miles (3,100 km) long and some of it has already been fenced off. Long divisionThe Trump wall may never become anything more solid than a metaphor for increased border surveillance, aided by technology, to keep illegal immigration under control. The Trump wall will pose a significant obstacle for such movements. Build bridges insteadPreexisting security barriers across the US-Mexico border are already making life difficult for local wildlife, according to peer-reviewed research. One 2011 study even looked specifically at the US-Mexico border.

Source: The Star February 11, 2017 13:18 UTC