Slavic languages
Common roots and ancestry

Slavic languages descend from Proto-Slavic, their immediate parent language, ultimately deriving from Proto-Indo-European, the ancestor language of all Indo-European languages, via a Proto-Balto-Slavic stage. During the Proto-Balto-Slavic period a number of exclusive isoglosses in phonology, morphology, lexis, and syntax developed, which makes Slavic and Baltic the closest related of all the Indo-European branches. The secession of the Balto-Slavic dialect ancestral to Proto-Slavic is estimated on archaeological and glottochronological criteria to have occurred sometime in the period 1500–1000 BCE.

A minority of Baltists maintain the view that the Slavic group of languages differs so radically from the neighboring Baltic group (Lithuanian, Latvian, and the now-extinct Old Prussian), that they could not have shared a parent language after the breakup of the Proto-Indo-European continuum about five millennia ago. Substantial advances in Balto-Slavic accentology that occurred in the last three decades, however, make this view very hard to maintain nowadays, especially when one considers that there was most likely no " Proto-Baltic " language and that West Baltic and East Baltic differ from each other as much as each of them does from Proto-Slavic.
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