This is a description of President Donald Trump's proposed wall along the United States-Mexico border. The wall would be a physical barrier designed to prevent illegal immigration and drug smuggling. It would span the entire length of the border, and would be constructed of concrete, steel, or other materials
From Wikipedia
A border wall has been built along portions of the Mexico–United States border in an attempt to reduce illegal immigration to the United States from Mexico. The barrier is not a continuous structure but a series of obstructions variously classified as "fences" or "walls".