Wikipedia:Selected anniversaries/December 6
December 6: Independence Day in Finland (1917), Constitution Day in Spain.
- 1768 - The first edition of the Encyclopædia Britannica was published.
- 1917 - Halifax Explosion: A ship in Halifax Harbour carrying trinitrotoluene (TNT) and picric acid caught fire after a collision with another ship and exploded, devastating Halifax, Canada.
- 1922 - The Irish Free State came into existence, one year after the signing of the Anglo-Irish Treaty.
- 1957 - Project Vanguard: An attempt to launch the first American satellite failed with an explosion on the launch pad at Cape Canaveral (pictured).
- 1989 - Marc Lépine killed 14 women in the École Polytechnique Massacre in Montreal, leading to new gun control laws in Canada.
Recent days: December 5 – December 4 – December 3
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