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In page Minsk:

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Throughout its history Minsk has been a city of many languages. Initially most of its residents spoke Ruthenian (which later developed into modern Belarusian). However, after 1569 the official language was Polish.[1] In the 19th-century Russian became the official language and by the end of that century it had become the language of administration, schools and newspapers. The Belarusian national revival increased interest in the Belarusian language – its use has grown since the 1890s, especially among the intelligentsia. In the 1920s and early 1930s Belarusian was the major language of Minsk, including use for administration and education (both secondary and tertiary). However, since the late 1930s Russian again began gaining dominance.[citation needed]