▁a ▁part ▁of ▁un ified ▁Germany ), ▁and ▁Czech oslov ak ia ▁obtained ▁most ▁of ▁C iesz yn ▁S iles ia . ▁Mill ions ▁of ▁S iles ians , ▁mostly ▁of ▁German ▁eth nic ity , ▁were ▁subsequently ▁exp elled , ▁but ▁after ▁being ▁s ift ed ▁out ▁from ▁the ▁eth nic ▁Germ ans ▁by ▁a ▁process ▁of ▁" n ational ▁ver ification ", ▁the ▁S iles ians ▁class ified ▁as ▁" aut och th ons " ▁by ▁the ▁Polish ▁commun ist ▁authorities ▁were ▁allowed ▁to ▁remain , ▁and ▁they ▁were ▁intens ely ▁pol on ized . ▁ ▁Between ▁ 1 9 5 5 ▁and ▁ 1 9 5 9 , ▁under ▁the ▁super vision ▁of ▁the ▁Red ▁Cross , ▁some ▁of ▁the ▁remaining ▁S iles ians ▁were ▁able ▁to ▁em igr ate ▁to ▁West ▁and ▁East ▁Germany ▁to ▁reun ite ▁with ▁their ▁families ▁in ▁Germany . ▁But ▁some ▁had ▁to ▁wait ▁for ▁years . ▁Until ▁ 1 9 8 9 , ▁nearly ▁ 6 0 0 , 0 0 0 ▁S iles ians ▁em igr ated ▁to ▁Germany . ▁ ▁Between ▁ 1 9 4 5 ▁and ▁ 1 9 4 9 , ▁millions ▁of ▁eth nic ▁Pol es ▁from ▁the ▁former ▁( pre - 1 9 3 9 ) ▁eastern ▁Poland ▁( es pecially ▁L viv , ▁Vol h yn ia , ▁Pod olia , ▁Vil nius , ▁etc .) ▁and ▁central ▁Poland ▁moved ▁into ▁S iles ia , ▁particularly ▁in ▁Lower ▁S iles ia . ▁Since ▁the ▁end ▁of ▁Commun