In new england, foot-long sandwiches are called "grinders," while in many other parts of the country they are called "subs." this is an example of the impact of

Regional culture

Explanation:

Regional culture refers to the activities that are carried out in the particular geographical areas as a part of their culture which are created and fostered by the region's residents and reflecting ethnic, linguistic, historical and cultural regional identity of the region

Here,

the calling the foot long sandwiches as subs or grinders reflects the regional culture of naming it homogeneously around their region and reflects the different identities of the New England and the other parts of the country.

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