The Nagorno-Karabakh conflict between Armenia and Azerbaijan began.
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Jesus Christ's Last Supper was held.
The Netherlands became the first country in the world to allow same-sex marriage.
Canada formed the territory of Nunavut to recognize the traditional lands of their native Inuit people.
Great Britain claimed The Straits Settlements as crown colonies: Singapore, Penang, and Malacca.
NASA celebrated April Fool's Day by telling the world that they found water on Mars.
