Where does it stop though?
Do we then send the Anglo-Saxons back to Scandinavia and claim the country for those of Celtic Briton heritage? Send all of the Isrealis back to the countries around the world where they came from?
But then what happens if the Native Americans decide to send everybody back to where they came from....we Celtic Britons have only just got rid of the bloody Anglo Saxons, and then in comes a wave of people with ridiculous accents and ridiculous ideas like being able to speak their mind and live their own lives. We live in a newly reinstated tribal culture, we can't have people coming in here choosing how they want to live their lives. The Americans have sent them back to where they came from, but what if we then want to send them back to where they came from more recently?
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