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We have discussed the logistical, legal and monetary problems of building the "Trump Wall" at times. This Washington Post article digs deeper into the logistical and legal problems.
Washington Post, January 25, 2017: 5 challenges Trump may face building a border wall
Rough terrain: While most of the current border fence exists west of El Paso, Tex. in relatively easy terrain, going east in the other direction the border switches from relatively straight lines to the winding path of the Rio Grande cutting through the mountains of Big Bend National Park..
Texas landowner lawsuits: Much of the wall in New Mexico and Arizona is on public lands. Not so for Texas where most land along the river is privately owned. Forcing eminent domain on Texas cattle ranchers will result in hundreds of lawsuits based on previous experience in building fences.
Meandering River: The Rio Grande river has meandered its course over time resulting in placing the border fence far from the actual river. Some Americans actually live on the Mexican side of the border fence. An example is the River Bend Resort in the photo of the article. Will the government buy out some 200 houses in that resort to build that fence/wall?
Problems with Surveillance: Janet Napolitano famously remarked, “You show me a 50-foot wall, and I’ll show you a 51-foot ladder.” Cameras and sensors can help with surveillance but previous technical problems with building a virtual fence were insurmountable and the project was scrapped.
Migrants are determined: The number of migrants and refugees crossing the border fleeing war, corruption and murder in their home countries of El Salvador, Guatemala and Honduras has overwhelmed border agents. UNHCR reports that asylum seekers have increased fivefold since 2012. Apprehensions of unaccompanied children have doubled in the past three years. Those migrants declaring themselves to be refugees enter into a different legal system than those who are simple illegal immigrants seeking work. However, that's a subject for a different thread.