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.
The name 'Euro' was officially adopted for European Currency.
The US State Department increased the reward for information on the Islamic State leader Abu Bakr al-Baghdadi to $25 million.
The Boston Tea Party protest occurred.
The Great White Fleet began its worldwide navigation.
