World War I, also known as the Great War, was a major conflict that took place from 1914 to 1918. Canada, as part of the British Empire, joined the war when Britain declared war on Germany. Many Canadians volunteered to fight, believing it was their duty to defend the British Empire.

The causes of World War I, which began in 1914, are commonly attributed to a complex web of factors, notably Nationalism.
Intense national pride and desires for independence among ethnic groups within empires (such as the Slavs in the Balkans) contributed to an environment ripe for conflict.
Nationalism fueled an environment of competition and distrust among countries, contributing to militarism, the formation of alliances, and imperialism, all of which set the stage for World War I.

Canada started World War I with a small, modestly equipped military but rapidly expanded and developed its forces into a formidable fighting force as part of the Allied war effort.

The early weeks of the war were marked by rapid troop movements and major battles, as both sides attempted to gain an advantage.
However, the initial expectation of a short conflict quickly faded as both sides dug in for a prolonged and grueling war of attrition, marked by trench warfare on the Western Front.

World War I was a catalyst for numerous technological, medical, and military advancements, as nations poured resources into finding new ways to gain an advantage in the conflict.

World War I was a pivotal event in Canadian history that accelerated its transition from a British colony to a more autonomous, confident, and unified nation with a significant role on the world stage.

Canada played a significant role in World War I, with Canadian forces participating in many key battles on the Western Front.
These battles not only showcased the bravery and skill of Canadian troops but also contributed significantly to the Allied war effort.