Greece was done more harm than good by the hellenic expansion east. Rome was done more harm than good by the roman extension east.
Old Europe (Byzantium-Balkans), Mediterranean Europe (Classical Civilization), Northern europe (Germania), Slavic Intermarium Europe (borderlands), and Russian Europe are unique sub-civilizations. North African civilization was previously mediterranean and caucasian but has been destroyed by the muslim conquest. Byzantine, Anatolian, Persian civilizations have been destroyed by muslim conquest. Roman civilization was destroyed by germanic raids, christian undermining, byzantine conquest, and the accumulation of raids by the muslim conquest.
NEVER EXPAND BEYOND YOUR KIN