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The lack of the fingerprint sensors is related to a software limitation, not a hardware one, which means, today you will be able to enable and use the fingerprint scanners on the US version of Xperia XZ and Xperia X Compact.
The process is quite simple, all you have to do is to follow this helpful guide provided by the guys at the Xperia Blog at this link, and then flash your Xperia device to a different region. Once you have completed the flashing process, you can to enable and use the fingerprint scanner on your Xperia phone.