In short, a "Yankee" is defined by context. As the famous adage attributed to E.B. White goes: To foreigners, a Yankee is an American. To Southerners, 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 someone who eats pie for breakfast. It remains a powerful, multifaceted label that captures the complexity of American identity.
Perhaps the most famous modern iteration of the name is the New York Yankees baseball franchise. As one of the most successful and recognizable sports teams in the world, the "Yankees" brand has exported the term to every corner of the globe. The iconic "NY" logo is seen on hats from Tokyo to London, often representing a general sense of American "cool" or prestige rather than a specific allegiance to the Bronx-based team.
Internationally, "Yankee" (often shortened to "Yank") is a shorthand for any citizen of the United States. In this context, it can be used affectionately or as a political critique, most notably in the slogan "Yankee go home." This global usage ignores internal regional nuances, collapsing the diverse American identity into a single, recognizable archetype.