Yesterday, Canada has declared war on Germany in the town of Ypres, Belgium.
It all happened when Britain supported Belgium and got Canada involved because Canada is a part of Britain. The important sequential events are: Britain is called to protect Belgium, and Canada, as part of British Empire is involved.
Basically, this war has started with an assassination of the Austria's archduke. It is caused by this new rivalry between the alliance and entente; and a promise made by Britain to Belgium with the proof of the treaty.
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