The issues connected with the events of 17th September, 1939 and the occupation of north-eastern land of the II Republic of Poland by USSR belong to the group of subjects that are quite well elaborated in Polish historiography. After opening post-Soviet archives a lot of source materials as well as joint works and monographs on this subject have been published. Despite this, due to over 50-year-long research retardation as well as inevitable controversy in the evaluation of individual phenomena, the issues of Eastern Borderland in 1939-1941 still arise intensive interest of not only Polish but also Belorussian, Ukrainian and Lithuanian researchers. Historians pay special attention to the issues of national relations in the north-eastern lands of the II Republic of Poland seized by USSR. Discussing various aspects of national policy in recent years they paid attention to the myths and stereotypes, mainly referring to the issues of Jewish population's collaboration with Soviet authorities and the images of a Soviet army soldier. Analyzing Soviet occupation, most researchers try to find the reasons and explanations for the participation of Poles and Belorussians in anti-Jewish pogroms at the beginning of the German-Soviet war. It should be noticed, however, that works on ethnic relations pay more attention to Polish and Jewish communities and their attitudes to authorities rather than to Belorussian population's behavior. Moreover, social and economic issues, which are presented by the researchers as those that significantly influence people's moods, arise interest as well.
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