'historically-unified' originates from the combination of 'historically' and 'unified'. 'Historically' comes from 'history', which originates from Greek 'historia', meaning 'inquiry, knowledge acquired by investigation'. 'Unified' comes from Latin 'unificare', where 'uni-' meant 'one' and 'facere' meant 'to make'.

'Historically' evolved from the Old French 'historie', while 'unified' evolved from the Latin 'unificare'. The combination of these words into 'historically-unified' is a modern English construct.

Initially, 'unified' meant 'made one', and 'historically' referred to 'pertaining to history'. Together, they evolved to describe something unified over time.