Half a century ago, I’d ride my motorcycle out of El Paso and into NM along the border. Back then the border was marked with an ordinary four-wire barbed wire fence with a border obelisk every mile. But then we weren’t telling the world that they were all free to come in.
On another note, in Costa Rica (and likely other Latin American countries) razor wire results in a massive reduction of home burglaries and break ins.
Cool, that’s what I wanted to know. Thank you!