SAN ANTONIO DOES HAVE A WALL: IT IS CULTURAL IE SANCTUARY CITY, MAKES IT DIFF THAN OTHER AMERICAN CITIES THAT ARE NOT.
https://en.wikipedia.org/wiki/Wall
DEFINE WALL:
A wall is a structure that defines an area, carries a load, or provides shelter or security. There are many kinds of walls, including:
Defensive walls in fortifications
Walls in buildings that form a fundamental part of the superstructure or separate interior rooms, sometimes for fire safety
Retaining walls, which hold back dirt, stone, water, or noise sound
Walls that protect from oceans (seawalls) or rivers (levees)
Permanent, solid fences
Border barriers between countries
Brick wall
Precast wall
Stone wall
Glass wall (only when most of the wall, in smaller amounts it is called a window)
Doors are mobile walls on hinges which open to form a gateway
Wall comes from Latin vallum meaning "…an earthen wall or rampart set with palisades, a row or line of stakes, a wall, a rampart, fortification…" while the Latin word murus means a defensive stone wall.[1] English uses the same word to mean an external wall and the internal sides of a room, but this is not universal. Many languages distinguish between the two. In German, some of this distinction can be seen between Wand and Mauer, in Spanish between pared and muro.
Walls in popular culture
Walls are often seen in popular culture, representing barriers preventing progress or entry. For example, the progressive/psychedelic rock band Pink Floyd used a metaphorical wall to represent the isolation felt by the protagonist of their 1979 concept album The Wall. American poet laureate Robert Frost describes a pointless rock wall as a metaphor for the myopia of the culture-bound in his poem "Mending Wall", published in 1914. In a real-life example, the Berlin Wall, constructed by the Soviet Union to divide Berlin into NATO and Warsaw Pact zones of occupation, became a worldwide symbol of oppression and isolation.
In some cases, a wall may refer to an individual's debilitating mental or physical condition, seen as an impassable barrier.
Another common usage is as a communal surface to write upon. For instance the social networking site Facebook previously used an electronic "wall" to log the scrawls of friends until it was replaced by the "timeline" feature.
https://en.wikipedia.org/wiki/Wall#Walls_in_popular_culture