] Since the earliest research into the the English Language
] as spoken in North America was begun by Noah Webster in
] the early 18th century, the regional variations in
] dialect have always been the most challenging and
] difficult to explain field. Since the development of
] carbonated beverage in 1886, one of linguistic
] geography's most important and least investigated
] phenomena has been the sharp regional divisions in the
] use of the terms "pop" and "soda." Due to the domination
] of hard-line conservative lingusitic geographers in such
] leading institutions such as Harvard, Yale, Stanford and
] the University of the West Indies, this dilemma has been
] swept under the rug . . . until now. Using the new
] technologies of the Internet and the World Wide Web, I
] and my colleagues at the California Institute of
] Technology and Lewis & Clark College are undertaking a
] bold new research into this fascinating area.

Great interactive maps to go along with this.

The Pop vs. Soda Page