Conservationists: Trump border wall has scarred wilderness areas, other PAs

In the 1980s, when Kevin Dahl first began visiting the Organ Pipe Cactus national monument in southern Arizona, the border was unmarked, save for a simple fence used to keep cattle from a ranch in the US from crossing into Mexico. In those days, park rangers would call in their lunch orders at a diner located just across the border.

Since then, a 30ft steel bollard wall has replaced the old barbed wire fence at Organ Pipe. The towering steel barrier cuts through the Unesco reserve like a rust-colored suture.

https://www.theguardian.com/environment/2020/oct/31/trump-border-wall-wilderness-wildlife-impact