The most accurate response regarding how World Wars I and II affected global cultural exchange is: They brought people together from countries who were fighting in alliance together.
Both world wars involved extensive collaboration among allies, which facilitated cultural exchanges through the movement of troops, sharing of ideas, and increased communication among countries. Despite the destruction and challenges posed by the wars, the interactions among diverse cultures during this time led to some significant exchanges in art, music, fashion, and ideas, laying foundations for later cultural globalization.