Despite recent attention to wall building as a security measure, the building of barriers along the U.S. – Mexico border is not a new phenomenon. The U.S. Secure Fence Act of 2006 funded the single-largest domestic building project in the twenty-first century and financed approximately 700 miles of fortification, dividing the U.S. from Mexico at a cost of up to $16 million per mile. Today, approximately one third of the 1,954-mile-long border between the U.S. and Mexico has been walled off. Ronald Rael will discuss his book, Borderwall as Architecture: A Manifesto for the U.S. – Mexico Boundary, a timely re-examination of what the physical barrier that divides the United States of America and both a protest against the wall and a projection about its future.