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What should happen for Romance and Germanic languages spoken in W. Europe to retain much more inflectional morphology from their ancestral languages (Latin and Proto-Germanic) in the same way as Balto-Slavic languages did? Possible...?
Baltic and Slavic are the most conservative branch of Indo-European family, retaining much of the morphology of the Proto Indo-European language. Modern Lithuanian grammar is comparable to that of Sanskrit and Hoemric Greek.