Completing US-Mexico border wall would be daunting task

BROWNSVILLE, Texas (AP) — Close to the southern tip of Texas a border wall suddenly ends. Its final post sits in a dry cornfield half a mile (less than a kilometer) from the nearest bend in the Rio Grande river, the actual border with Mexico.
It would be easy to walk around it. Tires left by the border patrol rest nearby. Agents drag them behind trucks to smooth the cracked earth and check for footprints.
Unlike other famous barriers in history such as the Berlin Wall or the Great Wall of