For starters, I'm talking about both legal immigration and the illegal kind. There's something funny I've seen in my own country...

While my country shall remain undisclosed, I will say that we used to have a lot more immigrants -- both legal and illegal -- up until recently. These immigrants were mostly Colombians and Venezuelans. What happened? Why is it many of them left?

Not long ago, Colombia's economy has started to improve. Ever since then, we've been seeing less and less Colombians.

More recently was the election for Venezuela's congress where the opposition party under Henrique Capriles won the majority seats. Things seem to be looking up for Venezuela and even here, we started seeing less and less Venezuelans.

Seeing a pattern? In the face of improving economies of countries which your immigrants are from, it becomes likely that they will simply return to their home country.

More illicitly, Latinos in the illegal drug trade may come here as a stepping stone to get themselves and their drugs to Europe. If Europe can devalue illegal drugs through legalization and turn to harm reduction as a replacement for policing drugs and for us to do the same, there'd be even less incentive to migrate here with fell intentions.

In conclusion, you're better off improving the quality of life in the countries the immigrants come from. Building walls and hunting immigrants down like animals just isn't effective because when people get desperate, not only will they find a way around anti-immigration measures but even if they don't, they'll simply be persistent.

There's also the aspect of walls and hunting down foreigners like animals being inhumane but nobody really cares about being humane, it would seem.