 The wartime attempts to destroy Polish culture may have strengthened it instead . Norman Davies wrote in God 's <unk> : " In 1945 , as a prize for <unk> sacrifices , the attachment of the survivors to their native culture was stronger than ever before . " Similarly , close @-@ knit underground classes , from primary schools to universities , were renowned for their high quality , due in large part to the lower ratio of students to teachers . The resulting culture was , however , different from the culture of interwar Poland for a number of reasons . The destruction of Poland 's Jewish community , Poland 's postwar territorial changes , and postwar migrations left Poland without its historic ethnic minorities . The <unk> nation was no more . 
