The Anglo-Irish Treaty, agreed to by the British Parliament and Sinn Féin, was ratified.
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Mariah Carey's single 'All I Want for Christmas Is You' reached number one, 25 years after its release.
German armies took Allied forces by surprise in the Ardennes, marking the beginning of the Battle of the Bulge.
The name 'Euro' was officially adopted for European Currency.
The Pioneer 6 space probe was launched atop a Delta-E rocket.
The Boston Tea Party protest occurred.
