The Anglo-Irish Treaty, agreed to by the British Parliament and Sinn Féin, was ratified.
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Vasco da Gama became the first European to sail along Africa's East Coast.
'Jingle Bells' became the first song played in space when it was broadcast during NASA's Gemini 6 space flight.
The mayor of Flint, Michigan, declared a state of emergency over contaminated water.
The name 'Euro' was officially adopted for European Currency.
Virginia became the first state to ratify the Articles of Confederation.
