slav slavSlovakia and Slovenia have the same root from Proto-Slavic *slověn-. However, Slovakian is a West Slavic language in the same branch as Czech and Polish and Slovenian is a South Slavic language in the same branch as Serbo-Croatian, Bulgarian etc. The flags are similar because they use the pan-Slavic tricolour of blue, white and red which became popular during the revolutions of 1848 and romantic nationalism.
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