Mexico/United States border wall.....

    The border wall along the Mexico/US border is intended to reduce illegal immigration to the US from Mexico.  The barrier is not a continuous structure but a series of obstructions variously classified as "fences" or "walls".  Between the physical barriers, security is provided by a "virtual fence" of sensors, cameras and other surveillance equipment used to dispatch US Border Patrol agents to suspected migrant crossing.  In May 20011,the Depts of Homeland Security said it had 649 miles in place.  A total of 438 miles of new primary barriers were built during Trump's first term, though Trump had repeatedly promised a "giant wall" spanning the entire border.. The national border's length is 1954 miles of which 1256 miles is the Rio Grande and 699 miles is on land.

    On July 2022 The Biden administration announced it would fill four wide gaps in Arizona near yuma,  In October 2023 Biden announced that he was s=restarting wall construction on some part of the border due to the surge of migrant crossings, constructing an addition 20 miles of border wall.  On January 2025, re-elected Donald Trump edged to expand the wall during his second term.