It’s growing dark on Tijuana’s Avenida Revolución, the two-bit titty bars are starting to pump out their obnoxious mix of beats, and young Mexican girls in short skirts and high heels are looking for business from US tourists out for a wild weekend.

The problem is that there aren’t as many as there used to be. In fact, Tijuana, Mexico’s large and incredibly ugly border city on the Pacific coast, appears to be empty.