Excerpt from the Article
The most visual form of increasing the cost of migration for undocumented migrants—the building of walls and fences—has recently regained popularity among policymakers in Europe and the United States alike.
In 2015-16, several European borders were fortified or fences were built, at Calais and other borders like Hungary-Serbia, Austria-Italy and Macedonia-Greece. At the same time, President Donald Trump is pursuing an extension of existing border walls and fences at the southern border of the U.S.
For many, building a wall at the national borders is the most appealing way to curb illegal immigration, to regain control over entry and to improve security.
But often little thought goes into the effects such a border wall can have beyond reducing the absolute number of immigrants in the short term. [...]