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The Italian defeat at Adowa ibrings to an end her ambitions in Africa until the Libyan campaign. It also guarantees the independence of Ethiopia and brings the French to hatch their Fashoda expedition. It also brings down the government of Crispi and indirectly the reconciliation of Italy and France
So as it says on the tin-
Menelik decides a day earlier that he has to withdraw from Adowa as his forces have devoured the crops and can't live off the land anymore. The Italians don't launch their desperate attack but get reinforcements