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If Louis the Pious would have avoided all the civil wars and dynastic disputes (maybe not causing the disgraceful conflict with his nephew Bernard) that would eventually ruin the legacy of Charlemagne and break up the Empire in Verdun (843), so the Carolingian Empire would have last more time united...
...would ever France and HRE/Germany formed as we know them today?
...which language would have imposed as lingua franca after the decline of Latin? French? German? Italian?
...would the Carolingians be involved more in Spanish Reconquista?
...would they finally clash with the Byzantines in the Adriatic area? Open war between them?