The term soda is used all along the North East coast. NYC, Boston, etc.

They start calling it pop somewhere in eastern Pennsylvania (I know it is pop in Pittsburgh).

How far north and east it goes from there I do not know. 

by z1p101 on 02/15/2008 10:16:10 PM EST

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I swear in older movies it was, in which case some areas took the soda while others took the pop.  How it became to be called that in the first place, I'm not sure.

Then again the "pop" from the bubbles might be a clue.

by Tom Hanc on 02/15/2008 10:40:28 PM EST

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