Donald Trump, the president-elect of the United States has pledged to expand the border wall and make Mexico pay for it. "The Great Wall of China, built 2,000 years ago, is 13,000 miles, folks," Donald Trump said at a news conference at Mar-a-Lago, Florida on March 1, 2016 … "They didn’t have cranes. They didn’t have excavation equipment. The wall is 13,000 miles long. We need 1,000 miles and we have all of the materials.” The Great Wall of China was one of history's most costly failures.
In the case of the US-Mexican border wall, conclusions are not so clear. Shoring up the California border has sent undocumented migrants further east to the serpentine Rio Grande River, lined with thick reeds, where it is physically easier to cross undetected but significantly inflated fees demanded by coyotes and other players in the human trafficking networks controlled by Mexican drug cartels are making people think twice about whether the journey is worth it. Border enforcement has also gotten a lot more expensive for the US government, with more border patrol agents, extended walls, more vehicles, more aircraft, high-tech monitoring equipment and a surge in those seeking asylum working their way through the legal system.
The additional cost, risk, flat wages and many undocumented workers deciding it is safer to stay in the US instead of taking the risk to visit family back home, have been as effective collectively as the reinforced border wall at reducing the numbers of undocumented migrants crossing into the US.
In 1986, 1.6 million people were deported from the United States. By 2014, that number had dropped to less than half to 680,000 people. In the San Diego Border Patrol sector, where the border walls and fencing are most extensive, the number of apprehensions dropped, according to the Office of Immigration Statistics, by over 75% in the ten years from 2005 to the end of 2014 from 126,915 to 29,911. Over that same period of time, however, in the Rio Grande Valley, Texas sector the number of apprehensions nearly doubled from 134,161 to 256,393.