Demographics of Poland
According to GUS, about 38,325,000 people live in Poland, however, the same report states that the number of residents living in the country all the time is approximately 37,200,000; with 1,125,000 people living abroad for 6 to 7 months or more. It means that the permanent population may be correspondingly smaller.
History of Poland (1939–1945)
About 13.4 million Polish citizens lived in the areas seized by the Soviet Union. Of those, about 8.7 million were Ukrainians, Belarusians and Jews. The minorities' relations with the Polish authorities were generally bad and many of their members greeted and supported the arriving Red Army troops as liberators. The British and French responses to the "not unexpected" Soviet encroachment were muted.