Is park is an American English or British English?

Thank you.

no you also get South African English and probably a few more, like Australian or New Zealand EnglishEnglish is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread...

Not really. In conventional usages, the term "dialect" is usually reserved for variations within the Standard English varieties of the various nation-states where English is the dominant...

American

Sometimes, yes. Sometimes, no. It's no different the other way around.