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Notably, in 1920's in Poland there were two fiercely competing visions: one of Piłsudski, referring to "Jagiellonian" idea of multi-ethnic federation (including culture, languages, religions), and "ND" (National-Democrats) of single language (PL) and religion (Roman-Catholic). The latter ultimately won after Piłsudski's death, which resulted in abandoning Ukraine's in struggle with RSFSR and its eventual annexation into USSR. Same for Belarus and Baltics.