All Kindles are international. The difference between the UK version and the US version is the phone chip (I know that is not technically what it is) in the Kindle. Essentially, the UK version is sent with onw that is more commonly found in Europe and I think the rest of the world. The US version is sold with a chip from ATT. So a UK Kindle will probably work better in Sweden then a US based Kindle.
The US address is need to buy books without geographic restrictions from the US store. Use gift cards as well. Most folks report that they don't have to do much beyond this as long as they buy only a few books a week. Others report that a VPN blocker is a good thing and will male it easier for you to buy books from the US store.
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