https://www.cia.gov/library/publications/the-world-factbook/geos/pl.html
Poland
Polish 96.9%, Silesian 1.1%, German 0.2%, Ukrainian 0.1%, other and unspecified 1.7%
note: represents ethnicity declared first (2011 est.)
================================
基本上現在波蘭境內的德意志人都是世居民族,德國戰敗之後,蘇聯跟波蘭瓜分東普魯士,作為境內原居民的德意志人,都變成難民,被強行驅逐出境。