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Yes, the user identifier should remain constant if they are using the same device and browser, regardless of their location. To create a segment filter based on their first visit versus their current location, you can use the “users” and “country” dimensions in Google Analytics. To do this, you would need to create a new segment, add a condition for “country”, and specify the country for the first visit, then add another condition for “users” and specify the user identifiers. However, GA4 and UA handle user identifiers differently, so it may not be possible to track this perfectly. It’s typically easier to identify users based on their behavior, such as the pages they visited or actions they took on your website.
