Almost certainly what you see in Poland is not persistence of old but fresh settlement. After WW2, Poland recovered these western lands from Germany but lost ot

Almost certainly what you see in Poland is not persistence of old but fresh settlement. After WW2, Poland recovered these western lands from Germany but lost others in the east to USSR. A lot of people moved from there. https://twitter.com/Valen10Francois/status/1524040729210888192/photo/2 https://twitter.com/Valen10Francois/status/15240407292108881... Why these political maps are more likely to be caused by internal migration and not historical holdovers? Because the Civic Platform (Platforma Obywatelska, PO, yellow-orange on the map) received more votes in areas with more (internal) immigration. Not just in the west but also in the cities in the east. While these aren't unrelated, this is a long-time rooted vs freshly settled divide more than it is historical.