Final answer:
The popularity of the International Style in architecture led to a lack of cultural diversity in building designs, creating cities that resembled each other and lacked local cultural expression.
Step-by-step explanation:
One negative consequence of the popularity of the International Style on world architecture was A. Lack of cultural diversity in designs. The uniform adoption of this architectural style, characterized by an emphasis on volume over mass, use of industrial materials, rejection of ornament and color, and flat surfaces with areas of glass, led to a homogenization of the urban landscape. This phenomenon often resulted in cities around the world that looked remarkably similar to one another, detracting from the cultural uniqueness that might have been expressed through more localized and traditional architectural designs.