On December 6, 1917, the French munitions ship
Mont Blanc collides with the Norwegian ship
Imo in Halifax harbor, Nova Scotia. The
Mont Blanc is loaded down with war materials, mostly highly volatile. The ship explodes 20 minutes after the collision, the largest manmade explosion in pre-atomic age history. The blast kills nearly 1800, injures another 9000, and flattens the northern part of the city. Much of the destruction is caused by the 60-foot tsunami generated by the blast. The shock wave is felt in Cape Breton, nearly 130 miles away. Trivia note: the City of Boston's official Christmas tree is a tree sent every year by the City of Halifax in gratitude for aid rendered following the explosion.
On December 6, 1921, The Irish Free State, comprising four-fifths of Ireland, is declared, ending a five-year Irish struggle for independence from Britain. Like other autonomous nations of the former British Empire, Ireland was to remain part of the British Commonwealth, symbolically subject to the king. The Irish Free State later severed ties with Britain and was renamed Eire, and is now called the Republic of Ireland.
On December 6, 1768, the first volume of the Encyclopedia Britannica is published. Its 15th - and final - edition, published in 2008, would span 32 volumes, compiled by more than 4,000 contributors. In 1912, Britannica's publishers announce they would seize print publications and focus entirely online, ending the run of the English language's longest-running print encyclopedia at 244 years.
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