Asklemmy

Being from the USA, I can confidently say “Yankee” is a term that is fairly neutral in meaning. People from the South states use it to refer to basically any American not from the South, and I get the sense people from the UK use it to refer to anyone from the USA.

In my experience, “Gringo” seems to be a term used by Spanish-speakers (even ones from North and South America) to refer to English speakers who think they’re better than everyone, so it appears to be a term with negative connotations

In America, yankee means people from a particular part of America. But we use it here in Australia to mean any American. It's especially fun when people from the south (that is…the south of the country America, not from the continent of South America) take offence at the term IMO.

We also use "seppo" which is an Australian shortening slang of "septic", which is rhyming slang (of the kind used in both Australia and London, England) that comes via "septic tank" via "yank".

Gringo seems strange to me. I thought that was a predominantly Latin American term for white people, and would apply equally well to Americans as Canadians as Australians as (of particular relevance to someone from Spain) English…but only the white of each, so it would seem to me it shouldn't work as synonymous with "American" because it excludes African Americans, Asian Americans, etc. But I'm not Spanish or Latin American, so I might just be misunderstanding the word.

Edit: what yank means depending on where you are (allegedly):