"To foreigners, a Yankee is an American.
To Americans, a Yankee is a Northerner.
To Northerners, a Yankee is an Easterner.
To Easterners, a Yankee is a New Englander.
To New Englanders, a Yankee is a Vermonter.
And in Vermont, a Yankee is somebody who eats pie for breakfast."
e.b. white
And to most people outside of New York, a Yankee is a member of a baseball team that we despise and is usually appended with a swear word, e.g., "Damn Yankees"