Slavs are customarily divided along geographical lines into three major subgroups: West Slavs, East Slavs, and South Slavs, each with a different and a diverse background based on unique history, religion and culture of particular Slavic groups within them. Apart from prehistorical archaeological cultures, the subgroups have had notable cultural contact with <answer>non-Slavic Bronze- and Iron Age</answer> civilisations.
The Slav subgroups have had notable cultural contact with what kind of civilisations?
non-Slavic Bronze- and Iron Age