What process unifies people by providing common, shared experience through learning, often passed from one generation to the next. uniformitarianism catastrophism diffusion?

Uniformitarianism gives explanations and understanding for past events .

Catastrophism is the contrast of uniformitarianism . It is the theory that the Earth has been affected in the past by sudden, short-lived, violent events, possibly worldwide in scope. The term diffusion means borrowing of traits between cultures. according these definitions:
diffusion unifies people by providing common, shared experience through learning, often passed from one generation to the next