The Cotton Curtain is a series of fortification stretching from the Potomac River in Virginia to the Pacific cost at Tijuana. This nearly 2,800 mile long fortification dates back to the end of the Second Great War in 1945 following an Allied victory against the Central Powers. The original curtain consisted primary of square pyramids of reinforced concrete to impede the movement of barrels and other motorized infantry units.These mini fortifications called Dragon's Teeth or Snake Fangs in the Confederacy often proved less effective than many previous though, however they still served their purpose efficiently.