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As it says on the tin. I'm wondering which sources for tracking migrations into NW Europe and into the US Rust Belt-Northeast Megaopolis regions would be more reliable to do further research on an upcoming TL. Could any of you familiar with the era please reply where best to look for data?
Things I'm primarily interested in:
-Social structure
-Language/ethnic groups
-Rivalries to be wary of
-Population numbers
-Technological development