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I was thinking earlier on today about the History of Britain and the movement of peoples into and out of the islands over time: Celts, Romans, Anglo-Saxons, Vikings, Normans etc. Right up to the modern day.

I like living in a multicultural, Cosmopolitian Nation but I was wondering if it had to be this way? Is it possible to come up with a timeline where Britain is very isolated, xenophobic even, where immgration even from Mainland Europe near to impossible?

I think a reasonable place to start is no Roman Invasion which did much to enhance Britain's involvement in the rest of the continent, recognising of course there is some connection pre-Julius Ceaser.

But looking at the movement of Germanic Tribes and Vikings and the Dark Age period it feels increasingly doubtful such a "Splended Isolation" comparable with the Sakoku of Japan (recognising this occured from 17th to 19th century so I'm proposing something quite different, and there was still trade during this time) is even possible.

And thinking about the role of Christianity too; either the British Isles would need to remain Pagan but not succumb to any potential crusade analogue should it develop, since interaction as part of Rome religiously would be quite a lot of involvement. Or have a Christianity which is radically different in development.

Anyway, so I'm throwing it to the board. How isolated a Britain could we feasibly have?
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