Ключевые слова: america, architecture, barrier, border, boundary, building, ca, california, city, crossing, customs, desert, fence, forbidden, homeland, illegal, immigration, international, landscape, mexican, mexico, migration, national, nature, new, north, outdoors, patrol, road, san diego, scenic, security, sky, smugglers, smuggling, states, steel, surveillance, tijuana, trail, travel, united, usa, wall,