This is a question I am really interested in seeing how people in different parts of the country view it. That is: What states — if any — do you personally consider to be “yankee.” And too, if applicable, who exactly ARE “yankees.” A little preface first. As a native Texan and Southerner, it is a common term down here.
https://www.city-data.com/forum/city-vs-city/142173-what-states-do-you-personally-consider.html

