Hope no-one minds if I make a few contributions to this timeline.
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September 1st 1914 – The last known Passenger Pigeon dies in Cincinnati Zoo, thus rendering the species extinct.
September 2nd 1914 – The Papal Conclave ends after the ninth ballot with the election of Cardinal Domenico Serafini as the 258th Pope. Serafini subsequently takes the name ‘Pius XI’ in honour of his predecessor.
September 7th 1914 – John Simon, Attorney-General of England & Wales, is appointed Chancellor of the Exchequer, six days after the death of his predecessor, David Lloyd George.
October 4th 1914 – An Earthquake strikes south-western Turkey, killing over two thousand people.
June 14th 1916 – The Democratic National Convention begins in St. Louis, Missouri.
June 16th 1916 – The Democratic National Convention ends with the nomination of incumbent President Thomas Marshall, with former Connecticut Governor Simeon E. Baldwin as the Vice Presidential nominee.
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-Edit-
Ah crud, missed the part about the new French Pope. I'll italic the September 2nd entry and the rest of you can decide which new Pope to go with.
Also, I just noticed the 1916 Olympics are referred to as the 'Summer Olympics' - I feel I should point out that the Winter Olympics didn't actually exist until the 1924 Games.