Listen to an episode of American Countryside with Andrew McCrea: In 1874, Joseph Glidden, a banker, businessman and a farmer, designed and patented a type of wire fencing known as barbed wire.

The Border Patrol reinforced the border wall with wire in urban areas near ports of entry in Nogales and San Luis.

After they began discovering the barbed wire fencing along well-used trails and sections of the forest, they got together and began taking it all down themselves, even though the local sheriffs ...