How did Winnie-the-Pooh enter public american public domain if its a book published in the UK?

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Winnie-the-Pooh entered public domain in the USA, but how is it possible when the book wasn’t even in the USA?

Does that mean the USA puts any book from the world in their public domain as long as it has been more than 90 years? Do USA law can really have that power across other jurisdictions?

Like if a country has a law protecting their books for more than 100 years, seem unfair that America can suddenly break that copyright.

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