Sushi originated in Japan, but in the United States, it was originally only consumed in global cities. Since then eating sushi has become common throughout the country. This is an example of:

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Sushi's spread from global cities to widespread acceptance across the United States is an example of hierarchical diffusion, where an idea or product spreads from larger to smaller places or from people or places of influence to wider adoption.

Sushi Originated in Japan, but in the United States, It