For what reason did Canada become involved in WWI?How is the War Measures Act related to the first world war?

Great Britain declared war on Germany on August 4, 1914.
Because the country was under the dominion of the British Empire, Canada automatically
became involved. However, the next day the Canadian Governor General officially declared
war on Germany due to the overwhelming support of the country's citizens. (The majority
of these were of British descent.)

The War Measures Act was
both adopted and enacted during the first year of the war. This statue gave the Canadian
government "sweeping powers" in times of emergency, to include war. Almost four years
later the statute was altered to give the government even more authority in response to
the Russian Revolution in 1917.