Your answer would be trade. Hope this helps!
Answer:
The individual lives and acts within society but society is nothing, in spite of the combination of individuals for cooperative effort. On the other hand, society exists to serve individuals—not the other way around. Human life and society almost go together.
Explanation:
The answer is D because answers A, B, and C are simply spreading American culture throughout America, thats not cultural diffusion by any means.
Columbus departed from Castilian palos de la frontera to find a shorted trade rout to india.