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What geopolitical conditions would facilitate the continued germanic settlement west. The linguistic frontier between germanic and romance languages moved very far west during the post-Roman period, but then stabilized during the middle ages and was eventually even pushed back slightly in modern times. In the east however, the linguistic and ethnic frontier continued to expand throughout the middle ages and into modern times (before also being rapidly pushed back in the post-war settlements and population movements).
So, with a POD of 700 AD, what conditions will lead to continued germanic settlement in western europe, specifically modern France/Gaul?
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