Why was war popular with candians at first?

The British declaration of war automatically brought Canada into the war, because of Canada's legal status as a British Dominion which left foreign policy decisions in the hands of the British parliament. However, the Canadian government had the freedom to determine the country's level of involvement in the war.

Troops from Canada played a prominent part in World War One. Canada was part of the British Empire in 1914. As a result of this, when Great Britain declared war on Germany in August 1914, Canada was automatically at war. Along with other nations in the Empire, such as Australia and India, tens of thousands of Canadians joined the army in the first few months of the war.

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.