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Not offensive, but for example I don't think 'hygge' has taken off in America (could be wrong). British and American culture are very different, but I'd often read things described as "Anglo-Saxon" meaning "shit they do in Britain and/or possibly America we're not sure (maybe also Australia as well?)".
Most English-speakers (in this country at least) use it to mean these dead dudes: https://en.wikipedia.org/wiki/Anglo-Saxons
No idea really. I suppose it means anywhere people generally speak English, to me. I'll stop using it if it's weird or offensive?